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The Garden Geeks Successful Hot Capping/Wintersowing Seeds

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Here is The Garden Geeks list of seeds we have successfully hot capped (also known as winter sown) in previous years.  The zone in parenthesis is the zone in which a member has successfully sown the seed. 

This is a work in progress.  E-mail Us if you can add more!!

Botanical Names Starting with A
with links to their Guide Pages

Achillea millefolium - Yarrow (Zone 4)
commercial - sprinkle seeds on surface. Do not cover

Achillea ptarmica - Sneezeweed (Zone 4)
collected - surface sow seeds, do not cover

Aconitum lycoctonum subsp. neapolitanum (Zone 4)
collected - surface sow, do not cover. These seeds can take 5 days to several months to germinate.

Aconitum napellus - Monkshood (Zone 4)
collected - surface sow, do not cover.

Adenophora stricta - Ladybells (Zone 4)
collected - surface sow, germination can take one to three months.

Agastache cana - Wild Hyssop (Zone 4)
collected - barely cover with soil. Germinates quickly when weather hits 70 degrees.

Agastache foeniculum - Anise Hyssop (Zone 4, 5, 6, 7, 8)
collected and commercial - barely cover seeds with soil. Can tale as much as 1 to 3 months after temps reach 55ºF. Plants grown from seed will bloom second year.

Ageratina altissima - White Snakeroot (Zone 4)
collected - barely cover seed with soil, the fresher the seed, the better the germination.

Alchemilla alpina - Mountain Lady's Mantle (Zone 4)
colected - just cover seeds, germination can take up to a month once temps rise above 55.

Amsonia tabernaemontana - Eastern Bluestar (Zone 4)
collected - barely cover with soil, germination can take about a month after temps warm to about 60 degrees.

Anchusa azurea - Italian Bugloss (Zone 4)
collected - barely cover seeds with soil, fast germination after temps reach 70 degrees.

Anemone sylvestris - Snowdrop Anemone (Zone 4)
collected - difficult to germinate. used jars. took almost 3 months after temps reached 70 degrees before germination.

Angelica archangelica - Angelica (Zone 4)
collected - took 15 days after temps reached 70.

Antirrhinum majus - Snapdragon (Zone 4)
collected - sprinkle on the surface, do not cover with soil.

Aquilegia canadensis - Wild Columbine (Zone 4)
collected - surface sow

Aquilegia vulgaris - European Columbine (Zone 4)
collected

Arabis procurrens - Rockcress (Zone 4)
commercial - surface sow

Arisaema triphyllum - Jack In The Pulpit (Zone 4)
collected - barely cover with soil.

Armeria maritima - Sea Thrift (Zone 4)
commercial - barely cover seeds with soil.

Aruncus dioicus - Goat's Beard (Zone 4)
collected - sprinkle seeds on surface of soil. Do not cover seeds with soil.

Asclepias incarnata - Swamp Milkweed (Zone 4)
collected - barely cover seed with soil.

Asclepias speciosa - Showy Milkweed (Zone 4)
collected - barely cover with soil.

Asclepias tuberosa - Butterfly Weed (Zone 4)
collected - barely cover seeds with soil.

Aster pilosus - Downy Aster (Zone 4)
collected - barely cover seeds with soil.

Aster sericeus - Silky Aster (Zone 4)
collected - barely cover seeds with soil.

Aurinia saxatilis - Basket of Gold (Zone 4)
commercial - surface sow, do not cover seeds with soil. Germination will be fast once temps reach 60.

 

Botanical Names Starting with B
with links to their Guide Pages

Baptisia alba - White False Indigo (Zone 4)
collected - cover with about 1/4 inch of soil

Baptisia australis - Blue False Indigo (Zone 4)
collected - cover with about 1/4 of inch of soil.

Baptisia tinctoria - Wild Indigo (Zone 4)
collected - cover with about 1/4 inch of soil

Belamcanda chinensis - Blackberry Lily (Zone 4)
collected - barely cover seeds with soil

Bellis perennis - English Daisy (Zone 4)
commercial - do not cover seed with soil. germination is quick after temps reach about 70 degrees

Boltonia asteroides - Boltonia (Zone 4)
collected - barely cover seeds with soil.

Borago officinalis - Borage (Zone 4)
collected - self sows easily.

Brassica rapa var. chinensis - Bok Choy (Zone 4)
collected

Brunnera macrophylla - Siberian Bugloss (Zone 4)
collected - barely cover seeds with soil. This seed needs to be chilled for at least a month before germination.

 

Botanical Names Starting with C
with links to their Guide Pages

Callirhoe involucrata - Wine Cups (Zone 4)
collected - sow seeds on top of soil...seeds have to be chilled for at least 4 months before they will germinate.

Callistephus chinensis - China Aster (Zone 4)
commercial - barely cover. These seeds will not germinate if not chilled for several weeks first.

Campanula carpatica - Carpathian Harebell (Zone 4)
collected - sprinkle on the surface, do not cover with soil. keep out of strong hot sunlight.

Centaurea cyanus - Bachelor's Button (Zone 4, 5, 6, 7, 8)
commercial - barley cover, seeds sown in a dark place germinate better.

Clarkia amoena - Farewell-to-Spring (Zone 4, 5, 6, 7)
collected - do not cover seed with soil, best germinating results if you start seed about 2 months before last frost. Stronger plants from seeds sown outside.

Clintonia andrewsiana - Andrew's Bead-Lily (Zone 4)
collected - barely cover seed with soil. This seed can take 2 months to germinate once temps reach about 60 degrees.

Collinsia bicolor - Chinese Houses (Zone 4)
collected - cover with a quarter of an inch soil.

 

 

Botanical Names Starting with D
with links to their Guide Pages

Delphinium grandiflorum - Chinese Delphinium (Zone 4)
collected - barely cover seeds. Seeds need to be chilled for at least two weeks. They will germinate within 2-3 weeks once temp reaches about 60.

Dicentra spectabilis - Bleeding Heart (Zone 4)
collected - barely cover seed. This seed needs to be stratified.

 

Botanical Names Starting with G
with links to their Guide Pages

Gaillardia x grandiflora - Blanket Flower (Zone 4,5,6,7,8)
commercial - don't cover seeds with soil. They need light to germinate. Will germinate quickly when temps reach about 70 degrees.

Gentiana andrewsii - Bottle Gentian (Zone 4)
collected - barely cover seeds with soil.

Geranium sanguineum - Bloody Cranesbill (Zone 4,5,6)
collected - barely cover seeds with soil. Germination can take up to 2 months after temps reach 70 degrees.

Geum montanum - Alpine Avens (Zone 4)
Collected - barely cover seeds with soil. Germination can take up to 1 months after temps reach 65ºF.

Gillenia trifoliata - Bowman's Root (Zone 4)
collected - cover seeds with about a quarter of an inch soil.

Gypsophila elegans - Baby's Breath (Zone 4)
commercial - Barely cover with soil. Germination within 3 weeks after temps reach 70 degrees.

 

Botanical Names Starting with I
with links to their Guide Pages

Ipomoea purpurea - Morning Glory 'Sunrise Serenade' (Zone 4)
collected and commercial - about 1/8" below the surface. Bottle covered in snow. 2 years in a row complete success.

 

Botanical Names Starting with L
with links to their Guide Pages

Ligularia dentata - Bigleaf Ligularia (Zone 4, 5)
collected - Plant seeds on the surface. Don't cover with soil. Takes up to a month when temps reach 60 degrees.

Linum perenne - Blue Flax (Zone 4,5,6,7)
collected and commercial - cover with 1/8 of an inch of soil, germination in about a month when temps reach 65 degrees.

 

Botanical Names Starting with M
with links to their Guide Pages

Matthiola longipetala - Night-scented Stock (Zone 4)
collected - do not cover seeds with soil. Seeds germinate within 25 days after temps hit 70 degrees.

Moluccella laevis - Bells of Ireland (Zone 4)
collected - Don't cover seed with soil. Germinates in about a month once temps reach 60 degrees.

 

Botanical Names Starting with P
with links to their Guide Pages

Papaver alpinum - Alpine Poppy (Zone 4)
collected - barely cover seeds with soil (seeds need darkness). Germination in about 20 days after temps reach 70 degrees.

Papaver burseri - Alpine Poppy (Zone 4) collected - barely cover seeds with soil (seeds need darkness). Germination in about 20 days after temps reach 70 degrees.

Penstemon barbatus - Beardtongue (Zone 4)
commercial - Do not cover seeds with soil. Germination is within a month of temps reaching 65 degrees.

Phacelia campanularia - California Bluebells (Zone 4)
collected - Cover seeds with about a quarter of an inch of soil. Germination will be within a month of temps reaching 65 degrees.

Platycodon grandiflorus - Balloon Flower (Zone 4, 5, 6, 7, 8)
commercial and collected - Don't cover seeds with soil. Germination within a month of temps reaching 70 degrees. Seeds need light for germination.

Potentilla fruticosa - Shrubby Cinquefoil (Zone 4)
collected - Barely cover seeds with soil. Germination within a month of temps reaching 65 degrees.

Pulsatilla alpina subsp. apiifolia - Alpine Pasque-flower (Zone 4)
collected - This one is difficult to germinate. Can take up to 5 months after temps reach 60 degrees. Barely cover seeds with soil.

Pulsatilla hirsutissima - American Pasque Flower (Zone 4)
collected - This one is difficult to germinate. Can take up to 5 months after temps reach 60 degrees. Barely cover seeds with soil.

 

Botanical Names Starting with R
with links to their Guide Pages

Rudbeckia hirta - Black Eyed Susan (Zone 4, 5, 6, 7, 8)
collected- Don't cover seeds with soil. Germination within a month of temps reaching 70 degrees.

 

Botanical Names Starting with S
with links to their Guide Pages

Sanguinaria canadensis - Bloodroot (Zone 4)
collected - No notes given in journal, just said that they did sow in the winter.

Silene coronaria - Rose Campion (Zone 4,5,6,7)
collected - sow seeds on surface of soil. germination can take up to 30 days after temps reach 70 degrees. Seeds need light to germinate.

 

Botanical Names Starting with T
with links to their Guide Pages

Tagetes erecta - African Marigold (Zone 4, 8)
commercial - Barely cover seeds with soil, germination can take up to 2 weeks after temps reach 70 degrees.

Thermopsis villosa - Carolina Lupine (Zone 4)
collected - Barely cover seeds with soil, germination within a month of temps hitting 70 degrees.

Thunbergia alata - Black-Eyed Susan Vine (Zone 4)
collected - barely cover seeds with soil, germination within a month of temps reaching 65 degrees. Appears to germinate best with fresh seeds.

 

Botanical Names Starting with W
with links to their Guide Pages

Wisteria sinensis - Chinese Wisteria (Zone 4)
collected - cover seed with about an inch of soil, germination in about a month after temps reach 60 degrees.

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