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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Ochna serrulata

!

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.
Ocimum basilicum

*

This species needs special care as described.
germinate @ 25°C
Ocimum gratissimum

*

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...
soak in running water for 24 hrs. germinate @ 25 °
Ocimum sanctum

A

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

*

This species needs special care as described.
germinate @ 25 °
Oenothera 'Colin Porter'

A

Sow @ 20°C. Seed germinates within 3 months.
Oenothera 'Lemon Sunset'

J

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

A

Sow @ 20°C. Seed germinates within 3 months.
Oenothera acaulis v. aurea

A

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

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...
Oenothera caespitosa

A

Sow @ 20°C. Seed germinates within 3 months.
Oenothera caespitosa ssp. marginata

A

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

J

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

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...
Oenothera drummondii

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Oenothera fruticosa ssp. glauca

A

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

A

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

B

Sow @ 20°C. If seed does not germinate within 3 months, try 4°C for 1-2 months, then 20°C again.
Oenothera macrocarpa ssp. incana 'Pewter Moon'

B

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

B

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

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...
Oenothera perennis

A

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

A

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

A

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

L

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

Oenothera speciosa

A

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

2

Requires darkness.
Oenothera stricta

A

Sow @ 20°C. Seed germinates within 3 months.
Oenothera stricta 'Moonlight'

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Oenothera versicolor 'Sunset Boulevard'

A

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

L

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

Olsynium douglasii

L

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

Omphalodes cappadocica

A

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

?

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.

2

Requires darkness.

A

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

A

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

2

Requires darkness.
Omphalodes linifolia 'Venus Navel'

A

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

2

Requires darkness.
Omphalodes linifolia alba

2

Requires darkness.

A

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

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...
Omphalodes luciliae

!

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.
Omphalodes luciliae '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.

A

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

2

Requires darkness.
Onobrychis cadmea

A

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

A

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

A

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

A

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

L

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

Onobrychis transsilvanica

A

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

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.

N

Sow directly in garden.

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
Onoclea sensibilis

A

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

*

This species needs special care as described.
pour boiling water over milled sphagnum moss, sow seeds, enclose in plastic bag
Ononis rotundifolia

A

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

2

Requires darkness.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU
Ononis spinosa

A

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

1

Resents transplanting.

6

Requires scarification. Nick or rub between sheets of sandpaper. See https://youtu.be/icB9HrqdQqU

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
Onopordum acanthium

A

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

5

Germination is successful only when GA3 is used.

*

This species needs special care as described.
squeeze seeds to determine which are viable, 15% germination rate
Onopordum algeriense

A

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

2

Requires darkness.

5

Germination is successful only when GA3 is used.

*

This species needs special care as described.
squeeze seeds to determine which are viable, 15% germination rate
Onopordum boissieri

L

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

*

This species needs special care as described.
squeeze seeds to determine which are viable, 15% germination rate
Onopordum carduchorum

A

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

2

Requires darkness.

5

Germination is successful only when GA3 is used.

*

This species needs special care as described.
squeeze seeds to determine which are viable, 15% germination rate
Onopordum illyricum

J

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

3

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

A

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

4

Germination is improved by using GA3.
Onopordum nervosum

L

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

*

This species needs special care as described.
squeeze seeds to determine which are viable, 15% germination rate
Onopordum sibthorpianum

A

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

2

Requires darkness.

5

Germination is successful only when GA3 is used.

*

This species needs special care as described.
squeeze seeds to determine which are viable, 15% germination rate