Germination Guide

Click on a species name below to see it's germination tips.
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Helianthemum nummularium ssp. nummularium

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
Helianthemum oelandicum ssp. alpestre

D

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

A

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

J

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

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

Helianthus 'Lemon Queen'

J

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

A

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

A

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

A

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

?

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.
Helianthus salicifolius

A

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

A

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

A

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

2

Requires darkness.
Helichrysum chionophilum

!

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.
Helichrysum milfordiae

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Helichrysum plicatum ssp. plicatum

!

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.
Helichrysum sessilioides

A

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

A

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

A

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

!

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.

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.
Heliopsis scabra

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Heliopsis helianthoides 'Asahi'

A

Sow @ 20°C. Seed germinates within 3 months.
Heliopsis helianthoides 'Loraine Sunshine'

*

This species needs special care as described.

A

Sow @ 20°C. Seed germinates within 3 months.
said to be sterile, but experience shows that it seeds about modestly
Heliopsis helianthoides variegated

A

Sow @ 20°C. Seed germinates within 3 months.
Heliopsis helianthoides var. scabra 'Prairie Sunset'

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Heliotropium arborescens 'Marine'

A

Sow @ 20°C. Seed germinates within 3 months.
Heliotropium 'Marine'

A

Sow @ 20°C. Seed germinates within 3 months.
Helleborus foetidus ex 'Variegata'

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus hybrid

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination, seeds germinate in cold part of cycle, may take up to 1 1/2 yrs of temperature cycling to germinate
Helleborus lividus

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus lividus ssp. corsicus

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus multifidus ssp. serbicus

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus argutifolius

!

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.

D

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

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
dry storage impairs germination
Helleborus argutifolius x sternii

!

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.

D

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

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
dry storage impairs germination
Helleborus foetidus

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus foetidus 'Gold Bullion'

!

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.

D

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

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
dry storage impairs germination
Helleborus foetidus 'Red Silver'

!

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.

D

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

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
dry storage impairs germination
Helleborus foetidus 'Sopron'

!

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.

D

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

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
dry storage impairs germination
Helleborus foetidus ex 'Wester Flisk'

!

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.

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

D

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

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination; seeds germinate in cold part of cycle, may take up to 1 1/2 yrs of temperature cycling to germinate
Helleborus niger

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus niger 'Kessen'

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus niger 'Potter's Wheel'

!

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.

D

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

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
dry storage impairs germination
Helleborus niger 'Sunset'

!

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.

D

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

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
dry storage impairs germination
Helleborus odorus

!

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.

D

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

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
dry storage impairs germination
Helleborus orientalis

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus orientalis 'Rainforest Mist'

!

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.

D

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

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
dry storage impairs germination
Helleborus orientalis ssp. guttatus

!

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.

D

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

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
dry storage impairs germination
Helleborus purpurascens

!

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.

D

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

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
dry storage impairs germination
Helleborus sp.

!

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.

D

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

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

*

This species needs special care as described.
dry storage impairs germination
Helleborus thibetanus

!

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.

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

dry storage impairs germination
Helleborus torquatus

!

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.

D

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

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
dry storage impairs germination
Helleborus viridis

!

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.

D

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

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
dry storage impairs germination
Helleborus viridis ssp. occidentalis

!

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.

D

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

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
dry storage impairs germination
Helleborus x ballardiae

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination
Helleborus x hybridus

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination; seeds germinate in cold part of cycle, may take up to 1 1/2 yrs of temperature cycling to germinate
Helleborus x hybridus 'Picotee'

!

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.

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

D

Use repeated cycles of 20°C, then 4°C for 3 months each. Germination is very prolonged.
dry storage impairs germination, seeds germinate in cold part of cycle, may take up to 1 1/2 yrs of temperature cycling to germinate