Germination Guide

Click on a species name below to see it's germination tips.
Search for a genus or species by entering specific words or parts of words.
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Townsendia grandiflora

A

Sow @ 20°C. Seed germinates within 3 months.
Townsendia hookeri

A

Sow @ 20°C. Seed germinates within 3 months.
Townsendia incana

A

Sow @ 20°C. Seed germinates within 3 months.
Townsendia parryi

A

Sow @ 20°C. Seed germinates within 3 months.
? short viability
Townsendia rothrockii

A

Sow @ 20°C. Seed germinates within 3 months.
? short viability
Townsendia sp.

A

Sow @ 20°C. Seed germinates within 3 months.
Trachelium caeruleum

A

Sow @ 20°C. Seed germinates within 3 months.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
Trachelium jacquinii

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Tradescantia sp.

J

Sow @4°C for 3 weeks, then place @20°C.
Tragopogon crocifolius

A

Sow @ 20°C. Seed germinates within 3 months.

N

Sow directly in garden.
Tragopogon dubius

A

Sow @ 20°C. Seed germinates within 3 months.
Tragopogon sp.

A

Sow @ 20°C. Seed germinates within 3 months.

N

Sow directly in garden.
Tragopogon turkestanicus

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

A

Sow @ 20°C. Seed germinates within 3 months.
Trautvetteria caroliniensis

A

Sow @ 20°C. Seed germinates within 3 months.
Triantha glutinosa

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Tricyrtis 'White Towers'

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

A

Sow @ 20°C. Seed germinates within 3 months.
Tricyrtis bakeri

A

Sow @ 20°C. Seed germinates within 3 months.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
Tricyrtis formosana 'Dark Beauty'

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

J

Sow @4°C for 3 weeks, then place @20°C.
Tricyrtis hirta

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

A

Sow @ 20°C. Seed germinates within 3 months.
Tricyrtis hirta 'Alba'

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

A

Sow @ 20°C. Seed germinates within 3 months.
Tricyrtis latifolia

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

A

Sow @ 20°C. Seed germinates within 3 months.
Tricyrtis macranthopsis

A

Sow @ 20°C. Seed germinates within 3 months.
Tricyrtis macropoda

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Tricyrtis puberula

A

Sow @ 20°C. Seed germinates within 3 months.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
Tricyrtis sp.

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
Trientalis borealis

A

Sow @ 20°C. Seed germinates within 3 months.

N

Sow directly in garden.
Trifolium incarnatum

A

Sow @ 20°C. Seed germinates within 3 months.
Trifolium repens

2

Requires darkness.

6

Requires scarification. Nick or rub between sheets of sandpaper.  See https://youtu.be/icB9HrqdQqU  Seed coat of Baptisia and Oxytropis and other Fabaceae can be scarified by soaking in boiling water. See http://botanicallyinclined.org/continuing-the-sowing-in-hot-water

A

Sow @ 20°C. Seed germinates within 3 months.
Trifolium rubens

F

Sow @ 4°C.
Trifolium rubens 'Red Feather'

F

Sow @ 4°C.
Trifolium sp.

?

We have incomplete information on the germination of this species. Sometimes we offer an educated guess about which approach you could try. Let us know what is successful.

A

Sow @ 20°C. Seed germinates within 3 months.
Trifolium trichocephalum

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Triglochin maritima

*

This species needs special care as described.
5° night and 25° day to germinate
Trillium albidum

*

This species needs special care as described.

2

Requires darkness.

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium cernuum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.
Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium cuneatum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.
Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium erectum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium erectum v. album

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium erectum v. blandum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium erectum v. declinatum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium flexipes

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium grandiflorum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

seeds must be stored cold and moist; germination unlikely after storage >6 months; if seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week; first need 20°C during which a radicle is formed, then cold (4° C) for at least 86 days to trigger emergence of cotyledon which will appear when temperature increases in spring (no further leaves are formed that year); if sown early enough, cotyledon will emerge next spring but usually not until second spring; keep seeds in pots for 2 years
Trillium kurabayashii

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

seeds must be stored cold and moist; germination unlikely after storage >6 months; if seeds are received dry, try hydrating in damp paper towel @ 20C for 1 week; first need 20 C during which a radicle is formed, then cold (4C) for at least 86 days to trigger emergence of cotyledon which will appear when temperature increases in spring (no further leaves are formed that year); if sown early enough, cotyledon will emerge next spring but usually not until second spring; keep seeds in pots for 2 years. Although hardy to zone 6, plant appears very early in spring and gets frost damage. Keep covered with evergreen boughs until frost is past.
Trillium luteum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

week; first need 20°C during which a radicle is formed, then cold (4C) for at least 86 days to trigger emergence of cotyledon which will appear when temperature increases in spring (no further leaves are formed that year); if sown early enough, cotyledon will emerge next spring but usually not until second spring; keep seeds in pots for 2 years
Trillium nivale

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

seeds must be stored cold and moist; germination unlikely after storage >6 months; if seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week; first need 20°C during which a radicle is formed, then cold (4C) for at least 86 days to trigger emergence of cotyledon which will appear when temperature increases in spring (no further leaves are formed that year); if sown early enough, cotyledon will emerge next spring but usually not until second spring; keep seeds in pots for 2 years
Trillium recurvatum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

week; first need 20°C during which a radicle is formed, then cold (4C) for at least 86 days to trigger emergence of cotyledon which will appear when temperature increases in spring (no further leaves are formed that year); if sown early enough, cotyledon will emerge next spring but usually not until second spring; keep seeds in pots for 2 years
Trillium rivale

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
tolerates dry storage
Trillium simile

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium sp.

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination unlikely after storage for more than 6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. Trilliums first need 20°C during which a radicle is formed, then cold (4°C) for at least 86 days to trigger the emergence of the cotyledon which will appear when temperature increases in spring. No more leaves are formed that year. If sown early enough, the cotyledon will emerge in the first spring; otherwise usually not until second spring. Keep seeds in pots for 2 years Göte Svanholm (Mid-Sweden) provides this advice: Trillium seeds do not survive dry storage. Trillium will need a first warm (20°) period during which a radicle is formed. Then a cold period (0-4°) to trigger emergence of cotyledon which will appear when temperature increases in spring. No further leaves are formed that year. If sown outdoors early enough, cotyledon will emerge next spring but usually it will not happen until second spring. This applies to those naturally growing in areas with real winters and not to (Pseudo)trilium rivale. The easiest way is to push the berry into the ground beside the parent plant.
Trillium undulatum

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

2

Requires darkness.

4

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Trillium vaseyi

!

Sow immediately. The viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience.

*

This species needs special care as described.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Seeds must be stored cold and moist. Germination is unlikely after storage >6 months. If seeds are received dry, try hydrating in damp paper towel @ 20°C for 1 week. During 3 months @ 20° a radicle is formed. Then 4°C for at least 86 days will trigger emergence of a cotyledon which will appear as the temperature increases in spring. No more leaves are formed that year. If sown early enough, a cotyledon may emerge first spring but usually not until second spring. Keep seeds in pots for 2 years
Triosteum aurantiacum

*

This species needs special care as described.

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

See http://botanicallyinclined.org/fridays-seeds-or-is-it-a-fruit-triosteum
Triosteum himalayanum

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
Triosteum pinnatifidum

*

This species needs special care as described.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
store seed cold and moist
Tripetaleia bracteata

A

Sow @ 20°C. Seed germinates within 3 months.
Tripetaleia paniculata

A

Sow @ 20°C. Seed germinates within 3 months.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...
Tripleurospermum caucasicum

K

Sow @ 10°C. Most species for which we suggest this temperature will also germinate at 20°C, but prefer the cooler temperature for sturdy growth.
Tripolium pannonicum ssp.tripolium

*

This species needs special care as described.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

A

Sow @ 20°C. Seed germinates within 3 months.
germination enhanced by smoke
Tripora divaricata

L

Give sown seeds several weeks @ 20°C to imbibe water (perhaps even germinate!), then expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring. See https://www.youtube.com/watch?v=SO_KKbGYTEM

Tripterygium regelii

A

Sow @ 20°C. Seed germinates within 3 months.