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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Penstemon pallidus

G

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

J

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

3

Requires light or the small seeds should be surface sown.

4

Germination is improved by using GA3.
Penstemon parryi

A

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

G

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

3

Requires light or the small seeds should be surface sown.

6

Requires scarification. Nick or rub between sheets of sandpaper.
Penstemon peckii

L

Expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring.
Penstemon pinifolius

A

Sow @ 20°C. Seed germinates within 3 months.
Penstemon pinifolius 'Shades of Mango'

A

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

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Penstemon procerus ssp. formosus

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Penstemon procerus ssp. tolmiei

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Penstemon procerus v. micranthus

G

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

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Penstemon procerus v. tolmiei

A

Sow @ 20°C. Seed germinates within 3 months.
Penstemon procerus x hybrid

G

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

F

Sow @ 4°C.
Penstemon richardsonii

F

Sow @ 4°C.
Penstemon rupicola

A

Sow @ 20°C. Seed germinates within 3 months.
Penstemon rupicola x cardwellii

A

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

F

Sow @ 4°C.
Penstemon scouleri

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
poor germination
Penstemon secundiflorus

G

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

3

Requires light or the small seeds should be surface sown.

4

Germination is improved by using GA3.
Penstemon serrulatus

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
Penstemon serrulatus 'Albus'

G

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

3

Requires light or the small seeds should be surface sown.

J

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

*

This species needs special care as described.

3

Requires light or the small seeds should be surface sown.

G

Sow @ 4°C for 3 months, then place @ 20°C for 3 months.
most interbreed and seed may not be what is labelled; germinates best with stored seed, even as long as 10 years at 20°
Penstemon strictus

A

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

*

This species needs special care as described.
germination percentage low; susceptible to wet and transplanting problems; sow in pot and leave undisturbed till they have grown to healthy plants
Penstemon thompsoniae v. desertipicti

G

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

3

Requires light or the small seeds should be surface sown.
Penstemon tolmiei

A

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

A

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

G

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

3

Requires light or the small seeds should be surface sown.
Penstemon uintahensis

A

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

F

Sow @ 4°C.
Penstemon venustus

G

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

3

Requires light or the small seeds should be surface sown.
Penstemon virgatus var. asa-grayi

1

Resents transplanting.

L

Expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring.
Penstemon watsonii

G

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

5

Germination is successful only when GA3 is used.

G

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

A

Sow @ 20°C. Seed germinates within 3 months.
Penstemon x mexicanus 'Sunburst Ruby'

A

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

A

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

3

Requires light or the small seeds should be surface sown.
Perilla frutescens v. crispa

A

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

3

Requires light or the small seeds should be surface sown.
Perilla frutescens v. nankinensis

A

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

3

Requires light or the small seeds should be surface sown.
Periploca sepium

A

Sow @ 20°C. Seed germinates within 3 months.
Persicaria japonica v. compacta

J

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

A

Sow @ 20°C. Seed germinates within 3 months.
5 % germination; very well drained soil
Persicaria polymorpha

J

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

A

Sow @ 20°C. Seed germinates within 3 months.
poor germination
Persicaria weyrichii

L

Expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring.

N

Sow directly in garden.

*

This species needs special care as described.
many persicaria species have very poor germination rates
Petkovia orphanidea

A

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

A

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

A

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

A

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

A

Sow @ 20°C. Seed germinates within 3 months.
Petrocoptis pyrenaica ssp. glaucifolia

A

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

A

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

A

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

L

Expose to fluctuating outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in spring.
Petrorhagia saxifraga

3

Requires light or the small seeds should be surface sown.

A

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

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.
Petunia x hybrida

A

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

A

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