Germination Guide

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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.
Tripterygium wilfordii

A

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

B

Sow @ 20°C. If seed does not germinate within 3 months, try 4°C for 1-2 months, then 20°C again.
Triteleia grandiflora

A

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

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

Triteleia ixioides

!

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.
Triteleia laxa

A

Sow @ 20°C. Seed germinates within 3 months.
Triteleia laxa ‘Koningin’

B

Sow @ 20°C. If seed does not germinate within 3 months, try 4°C for 1-2 months, then 20°C again.
Triticum spelta

A

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

A

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

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Trollius chinensis 'Golden Queen'

!

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

Trollius dschungaricus

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Trollius laxus 'Albiflorus'

!

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

Trollius acaulis

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Trollius altaicus

!

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.

E

Sow @ 20°C for 6 weeks, then place @ 4°C for 6 weeks, then slowly raise temperature to 10°C for 6 weeks. If there is no germination, repeat the cycle. This mimics fall sowing outdoors for spring germination.
Trollius chinensis

!

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

Trollius europaeus

E

Sow @ 20°C for 6 weeks, then place @ 4°C for 6 weeks, then slowly raise temperature to 10°C for 6 weeks. If there is no germination, repeat the cycle. This mimics fall sowing outdoors for spring germination.
Trollius europaeus 'Superbus'

E

Sow @ 20°C for 6 weeks, then place @ 4°C for 6 weeks, then slowly raise temperature to 10°C for 6 weeks. If there is no germination, repeat the cycle. This mimics fall sowing outdoors for spring germination.
Trollius hondoensis

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Trollius hybrid

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Trollius ircuticus

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

Trollius laxus

!

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

Trollius laxus v. albiflorus

!

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

Trollius ledebourii

!

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

Trollius pumilus

A

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

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Trollius x cultorum

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
Trollius x cultorum 'Cheddar'

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
Trollius x cultorum 'Golden Queen'

!

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.

F

Sow @ 4°C.

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

Trollius x cultorum 'Lemon Queen'

!

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

Trollius x cultorum 'New Moon'

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
Trollius x cultorum 'Orange Queen'

!

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

Tropaeolum incisum

A

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

A

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

A

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

A

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

A

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

A

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

A

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