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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Hosta fortunei v. stenantha

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta fortunei var. hyacinthina

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta fortunei var. rugosa

A

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

A

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta nakaiana x 'Golden Tiara'

A

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

A

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta sieboldiana v. elegans

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta sieboldiana v. glauca

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta sieboldii f. kabitan

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta sieboldii v. elegans

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Hosta Tardiana Group

A

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

A

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

A

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

A

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

A

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

A

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

A

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

A

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

A

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

N

Sow directly in garden.
Hutchinsia alpina

A

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

A

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

C

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

?

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.

*

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

best sown in fall; grow seedlings @ 4°C; leave in pot for 2 years before planting out
Hyacinthoides hispanica

J

Sow @4°C for 3 weeks, then place @20°C.
Hyacinthoides non-scripta

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...

F

Sow @ 4°C.
Have been observed to germinate in the cold after 6 months kept at 4° C.
Hydrangea arborescens

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Hydrangea aspera ssp. sargentiana

A

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

A

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

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.
Hydrangea serrata 'Koreana'

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.
Hydrastis canadensis

!

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.

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

Hydrophyllum canadense

!

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.

G

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

J

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

4

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.
ephemeral
Hylomecon japonicum

4

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.
Hymenolaena badachschanica

?

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

Hymenoxys herbacea

A

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

A

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

A

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

A

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

A

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

?

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.
Hymenoxys torreyana

A

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

*

This species needs special care as described.

4

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.
germinates best at 30 °C
Hypericum androsaemum

A

Sow @ 20°C. Seed germinates within 3 months.
Hypericum ascyron ssp. pyramidatum

A

Sow @ 20°C. Seed germinates within 3 months.
Hypericum ascyron v. pyramidatum

A

Sow @ 20°C. Seed germinates within 3 months.
Hypericum kalmianum 'Ames'

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

Hypericum adenotrichum

A

Sow @ 20°C. Seed germinates within 3 months.
Hypericum androsaemum 'Albury Purple'

A

Sow @ 20°C. Seed germinates within 3 months.
Hypericum androsaemum f. variegatum

A

Sow @ 20°C. Seed germinates within 3 months.
Hypericum androsaemum f. variegatum 'Mrs Gladis Brabazon'

A

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

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.

3

Requires light or the small seeds should be surface sown. See https://www.youtube.com/watch?v=RgkXUSI1GWo&index=1&list=UUJfYCNSWCIuOB2...