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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Sorghum decolor

*

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...
germinates best at 30°C
Sorghum bicolor

A

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

A

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

!

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.

A

Sow @ 20°C. Seed germinates within 3 months.
bog plant; stand pot in 3 cm water
Spigelia chiapensis

?

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.
Spigelia marilandica

J

Sow @4°C for 3 weeks, then place @20°C.
poor germination
Spilanthes acmella

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...
Spilanthes oleracea

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...
Spilanthes 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.
Spiraea ex 'Bridal Wreath'

?

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.
Spiraea sp.

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

Spiraea 'Bridal Wreath'

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

N

Sow directly in garden.
Spiraea japonica 'Goldflame'

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...
Spiraea miyabei

A

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

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.
Spiraea tomentosa

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

Spiranthes cernua

*

This species needs special care as described.
see http://prairieecologist.com/2011/08/15/ladys-tresses-orchids-in-prairie-seedings/
Spirea tomentosa

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

Spodiopogon sibiricus

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...
Sporobolus heterolepis

G

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

A

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

A

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

2

Requires darkness.
Stachys alopecuros

A

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

J

Sow @4°C for 3 weeks, then place @20°C.
Stachys minima

?

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.
Stachys montana subsp. montana

J

Sow @4°C for 3 weeks, then place @20°C.
Stachys officinalis 'Densiflorus'

A

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

A

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

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.
sow outdoors in spring
Stachys bicolor

J

Sow @4°C for 3 weeks, then place @20°C.
Stachys byzantina

A

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

A

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

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...

4

Stachys discolor

A

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Stachys macrantha 'Superba'

A

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

J

Sow @4°C for 3 weeks, then place @20°C.
Stachys monieri

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Stachys officinalis 'Hummelo'

A

Sow @ 20°C. Seed germinates within 3 months.
Stachys officinalis ssp. officinalis

A

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

A

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

A

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

J

Sow @4°C for 3 weeks, then place @20°C.
Stachys sylvatica

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
see cacti
Staphylea trifolia

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

Staphylea trifoliata

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

Staphylea bumalda

!

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

Staphylea pinnata

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

Stellaria chamaejasme v. chrysantha

D

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

A

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

7

Requires soaking. Place in warm water until seeds swell, usually 24-48 hours. Discard floaters and the water used for soaking. See https://youtu.be/dhL57pqnHHQ

C

Sow @ 20°C for 3 months, then place @ 4°C for 3 months.
Stewartia pseudocamellia

!

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.

5

Germination is successful only when GA3 is used. See http://botanicallyinclined.org/fridays-seeds-with-the-ga3-seeds-treatment

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

(a) harvest capsules when they turn from green to brown and are still non-dehisced; (b) maintain seeds under non-desiccation conditions at all times; (c) treat the seed with a 24 hour aerated water soak in 1 mM GA3 before warm stratification; and (d) follow a 3 month warm stratification period with at least 7 months cold stratification. See http://hriresearch.org/docs/publications/JEH/JEH_1999/JEH_1999_17_1/JEH%2017-1-44-46.pdf
Stewartia serrata

?

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.

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

Stigmatocarpum criniflorum

A

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

F

Sow @ 4°C.
Stipa arundinacea

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...