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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Sorbus torminalis

*

This species needs special care as described.
20° x 2 weeks, then 4° until germinated - up to 30 weeks
Sorbus yuana

?

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

Sorbus americana

G

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

2

Requires darkness.
Sorbus aucuparia 'Rossica'

*

This species needs special care as described.
20°C x 10 weeks then outdoors at end of March
Sorbus decora

!

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.
20°C x 2 weeks then 4°C x 16 weeks
Sorbus intermedia

!

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.
20°C x 2 weeks then 4°C x 16 weeks
Sorbus koehneana

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

Sorbus pohuashanensis

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.
Sorbus pseudovilmorinii

8

Pulpy coat inhibits germination. Remove by soaking and rinsing in clean water daily for approximately 7 days. Discard water.

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

Sorbus reducta

J

Sow @4°C for 3 weeks, then place @20°C.
Sorbus sambucifolia

!

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.
20°C x 2 weeks then 4°C x 16 weeks
Sorbus 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

Sorbus 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

Sorghastrum avenaceum

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Sorghastrum nutans

G

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