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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Silene uralensis ssp. apetala

A

Sow @ 20°C. Seed germinates within 3 months.
Silene uralensis ssp. arctica

A

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

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
poor germination
Silene viridiflora

A

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

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.
Silene viscosa

A

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

2

Requires darkness.
Silene vulgaris

A

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Silene x haageana

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

Silene zawadskii

A

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

J

Sow @4°C for 3 weeks, then place @20°C.
Silphium integrifolium

A

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

A

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

J

Sow @4°C for 3 weeks, then place @20°C.
Silphium trifoliatum

J

Sow @4°C for 3 weeks, then place @20°C.
Silybum marianum

A

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

N

Sow directly in garden.
Silybum sp.

A

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

A

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

A

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

8

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

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.
Sisymbrium luteum

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Sisyrinchium 'Pole Star'

J

Sow @4°C for 3 weeks, then place @20°C.
Sisyrinchium albidum

B

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

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...
Sisyrinchium angustifolium f. album

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.
Sisyrinchium bellum

A

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

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
30% germination
Sisyrinchium californicum

A

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

B

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

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.
Sisyrinchium idahoense

F

Sow @ 4°C.
Sisyrinchium idahoense v. idahoense

F

Sow @ 4°C.
Sisyrinchium macrocarpum

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

Sisyrinchium montanum

B

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

J

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

Sisyrinchium striatum

B

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

A

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

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.
Smelowskia calycina

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

Smilacina purpurea

!

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

Smilacina racemosa

G

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

*

This species needs special care as described.
place in moist sand in shade x 1 year; sow as soon as radicle appears
Smilax herbacea

H

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

A

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

*

This species needs special care as described.

C

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

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.
seedling will die down to form a tuber in the first year, should re-emerge the following spring.
Solanum lycopersicum

A

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

A

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

!

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.
Solanum atropurpureum

A

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

A

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

?

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.
Soldanella minima

!

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...

G

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

!

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.
Soldanella carpatica

!

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.

2

Requires darkness.
Soldanella carpatica x montana

!

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.

2

Requires darkness.
Soldanella hungarica

!

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.
Soldanella hungarica

!

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.
Soldanella minima 'Alba'

!

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...

G

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