Scanlan Nursery
Seed Germination and Culture Guide        
•        Cover seed means with a light layer of vermiculite.
•        
Plug weeks includes germination period.
•        
Finish weeks is time from potting the plug to sale.
FLOWER
COVER
SEED
Germination
in weeks
Plugs
weeks
Finish
weeks
Hardy
Zones
Comments
Agastache Pink Pop
yes
3-4
6-7
6-10
7-10
Grow at minimum 60F
Alyssum Luna
no
2-3
6-8
7-11
6-8
Sow to flower in 12-14 weeks
Ameria Joystick
yes
2-3
7-8
8-12
6-8
Sow to flower in 15-19 weeks
Asclepias Tuberosa
 
2-3
6
11-13
3-8
Sow Jan-Feb for June flowers. All
parts of plant are poisonours.
Campanula porscharskyana
yes
Irregular, 41F
ideal
4-8
6-10
3-7
Irrigate from bottom. Sow Jan for
Jun flowers; sow in final pot for
bloom in 6 mos
Centaurea montana
yes
2-3
4
4
3-7
Do not overwater during
germination
Chaenorhinum Summer Skies
yes
3
6-8
6-8
6-9
Sow Jan for May flowering
Coreopsis grandiflora Early
Sunrise
yes
1
5
8-10
4-9
Needs light to germinate, 100
days from seed
Coreopsis grandiflora Rising
Sun
yes
1
5
8-10
4-9
Needs light to germinate, 12
weeks from seed
Delphinium elatum Pacific
Giant series
yes
1
 
 
4-7
Prechill seed at 35F for 10 days,
sow immediately at 70-80F.
From sow to flower 16-24
weeks.  High humidity important.
Delphinium x hybrida Pagan
Purple
yes
 
 
 
 
Sow in 72 plug tray between
61-70F. Ideally use bottom heat
to germinate.
Dianthus barbutus
interspecific Amazon Duo
yes
1
4-5
11-14
6
From sow to flower 12-13 weeks
Dianthus plumarius Spring
Beauty
yes
 
 
 
4
 
Gaillardia aristata Arizona
Sun, Dazzler, Burgundy
yes
1-3
5
5
3/4 - 9
Sow Jan for May flowering
Gaura lindheimeri The Bride
yes
4
6-8
8-12
6-8
Sow Feb-May
Gypsophila Silverstar
yes
3
6-8
6-10
5-8
 
Heuchera Palace Purple
yes
4
6-8
6-10
4-7
Sold for ornamental foliage
Kniphofia Flamenco
yes
2-3
 
 
4
Sow in final pot in Jan for Jul
flowering
Lavender, lavandula
angustifolia
yes
3-4
6-8
18-20
4-9
Chill for 4 weeks first, the give
good light as soon as
germination occurs. 14-16 weeks
for May flowering
Leucanthemum White Knight
F1 hybrid
yes
 
 
 
3
 
Lobelia kalmii Blue Shadow
 
 
 
 
6
18 weeks from seed
Lupinus polyphylus Gallery
Series
yes
 
 
 
3
Nick or soak seed first
Nepeta Pink Cat
no
 
 
 
4
Withstands heat and cold well
Oenothera macracarpa
(missouriensis)
yes
1-2
6
4
4
Flowering pots in 12-14 weeks
Poppy, papaver nudicaule
Garden Gnome
yes
1-2
4-5
5-6
6-8
Flowering pots in 13-15 weeks.
Tap root formation, sow directly
in final pot.
Prunella grandiflora Bella
Deep Rose
yes
1-2
 
 
5
Sow in Feb for Jun flowering
Rudbeckia hirta Indian
Summer, Prairie Sun
 
 
 
 
5
 
Salvia x sylvestris Queen
series
yes
 
 
 
3
Flowering pots in 12-16 weeks
Scabiosa caucasica, House's
Hybrids, Perfecta, Ritz Blue
yes
2-3
4
6
4
Sow Jan for Jun flowering
Sedum
no
2
5
5
3
2-3 seedlings per pot
Polemonium viscosum
Bambino Blue
yes
3
6-7
8-14
4-7
Needs 16 hours of light for
flowering
Verbascum x hybrida
Southern Charm
yes
1
4-5
12
5
Needs long days to flower
Verbena canadensis Toronto
Silver Pink
 
 
4
8
 
Germinate at 70F, grow at 55F.  
Blooms all summer
Germination
Database
Coreopsis 'Rising Sun'
Origanum 'Kent Beauty'
ISiberian Iris
Sowing/Flowering
Chart