Germination Guide

Click on a species name below to see it's germination tips.
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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...
Stipa barbata

H

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

A

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

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...
Stipa caucasica

A

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

F

Sow @ 4°C.
Stipa sp.

A

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

F

Sow @ 4°C.
Stipa ucrainica

F

Sow @ 4°C.
Stokesia laevis

A

Sow @ 20°C. Seed germinates within 3 months.
Stokesia laevis 'Blue Danube'

A

Sow @ 20°C. Seed germinates within 3 months.
Stokesia laevis 'Klaus Jelitto'

A

Sow @ 20°C. Seed germinates within 3 months.
Stokesia laevis 'Peach Melba'

A

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

B

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

!

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

8

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

2

Requires darkness.

D

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

A

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

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...
Stylophorum diphyllum

!

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.

H

Use repeated cycles of 4°C, then 20°C for 3 months each. Germination is very prolonged.
dry storage for > 6 months is fatal; problems germinating even with fresh seed
Stylophorum lasiocarpum

D

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

C

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Styrax japonicus 'Carillon'

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Styrax japonicus 'Pink Chimes'

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Styrax japonicus 'Roseus'

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Succisa pratensis '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.
Succisa inflexa

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...
Succisa pratensis

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...
Succisa pratensis 'Nana'

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.
Succisella inflexa

A

Sow @ 20°C. Seed germinates within 3 months.
Succisella inflexa 'Frosted Pearls'

A

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

*

This species needs special care as described.

1

Resents transplanting.

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

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

A

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

N

Sow directly in garden.
plant does not tolerate phosphate in fertilizer or soil
Swertia schugnanica

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

Symphoricarpos 'Amethyst'

8

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

D

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

A

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

A

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

A

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

A

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

A

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

A

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

J

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

A

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

B

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

B

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

B

Sow @ 20°C. If seed does not germinate within 3 months, try 4°C for 1-2 months, then 20°C again.
Symphytum x uplandicum 'Axminster Gold'

A

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