Seeds that Require Special Treatment

Grow Your Health Gardening - Atlanta GA

When growing hydroponic plants, you will need to follow the same guidelines soil-based gardeners use with seed starting. The key thing is to know what the vegetable, herb, or flower plant needs to best start from seed.  Here’s a handy chart to reference before you start a plant from seed. (PDF version link available below)

 


Seeds that Need Light to Germinate

  • Achillea species — YARROW
  • Ageratum Houstonianum — FLOSSFLOWER
  • Alyssum montamum — BASKET OF GOLD
  • Anethum graveolens — DILL
  • Antirrhinum majus — SNAPDRAGON
  • Aquilegia species and hybrids — COLUMBINE
  • Arabis species — ROCK CRESS, WALL CRESS
  • Begonia species — BEGONIA
  • Brassica oleracea Acephala — ORNAMENTAL CABBAGE
  • Browallia speciosa — BROWALLIA
  • Campanula species —BELLFLOWER
  • Capicum anuum — ORNAMENTAL PEPPER
  • Chrysanthemum  Parthenium — MATRICARIA, FEVERFEW
  • Chrysanthemum x superbum — SHASTA DAISY
  • Coleus x hybridus — COLEUS
  • Coreopsis grandiflora — TICKSEED
  • Doronicum cordatum — LEOPARD’S BANE
  • Gailardia x grandiflora — BLANKET FLOWER
  • GerberaJamesonii hybrids — TRANSVAAL DAISY
  • Helichrysum bracteatum — STRAWFLOWER
  • Impatiens Wallerana — IMPATIENS
  • Lactuca sativa — LETTUCE
  • Labutaria maritima — SWEET ALYSSUM
  • Lynchis chalcedonica — MALTESE-CROSS
  • Matthiola species — STOCK
  • Moluccella laeves — BELLS OF IRELAND
  • Nicotianna alata — FLOWERING TOBACCO
  • Papaver orientale — ORIENTAL POPPY
  • Petunia x hybrida — PETUNIA
  • Platycodon grandiflorus — BALLOON FLOWER
  • Pelargonium domesticum — GERANIUM
  • Primula species except P. sinensis —PRIMROSE
  • Reseda odorata — MIGNONETTE
  • Salvia species — SALVIA (Red flowered varieties)
  • Sanvitalia procumbens — CREEPING ZINNIA
  • Sauterne species — SAVORY
  • Tithonia rotundifloria — MEXICAN SUNFLOWER
  • Hypericum perforatum — ST. JOHNSWORT
  • Nepeta cataria — CATNIP
  • Urtica dioica — STINGING NETTLE

Seeds that Need Darkness to Germinate

  • Borago officinalis — BORAGE
  • Calendula officinalis — POT MARIGOLD
  • Catharanthus roseus — PERIWINKLE
  • Centaurea Cyanus — BACHELOR’S BUTTON
  • Consolida ambigua — LARKSPUR
  • Coriandrum sativum — CORIANDER (CILANTRO)
  • Delphinium species — DELPHINIUM
  • Foeniculum species — FENNEL
  • Gazania rigens — TREASURE FLOWER
  • Lathyrus odoratus — SWEET PEA
  • Myosotis species — FORGET-ME-NOT
  • Nemesia strumosa — NEMESIA
  • Palaver species except Porientale — POPPY
  • Phlox species — PHLOX
  • Primula sinensis — CHINESE PRIMROSE
  • Salpiglossis sinuata — PAINTED TONGUE
  • Schizanthus x wisetonensis — BUTTERFLY FLOWER, POOR MAN’S ORCHID
  • Tropaolum majus — NASTURTIUM
  • Verbena species — VERBENA
  • Viola species — VIOLA, VIOLET, PANSY

Seeds that Require Soaking before Sowing

  • Abelmoschus esculentus — OKRA
  • Armeria maritima — THRIFT, SEA PINK
  • Asparagus officinalis — ASPARAGUS
  • Hibiscus species — MALLOW
  • Pomona species — MORNING GLORY
  • Lathyrus latifolius — PERENNIAL PEA
  • Lathyrus odoratus — SWEET PEA
  • Liriope Muscari — LILYTURF
  • Lupines species — LUPINES
  • Pastinaca sativa — PARSNIPS
  • Petroselinum crispum — PARSLEY

Seeds that Need Stratification before Sowing (Cold Treatment)

  • Angelica Archangelica — ANGELICA
  • Aquilegia species and hybrids — COLUMBINE
  • Brassica oleracea Acephala — ORNAMENTAL CABBAGE
  • Dicentra spectabilis — BLEEDING HEART
  • Dictamnus albus — GAS PLANT
  • Helleborus niger — CHRISTMAS ROSE
  • Hemerocallis hybrids — DAYLILY
  • Lavandula angustifolia — LAVENDER
  • Machaeranthera tanacetifloria — TAHOKA DAISY
  • Phlox paniculata — PHLOX
  • Primula species — PRIMROSE
  • Trillium ovatum — WAKE-ROBIN
  • Trollius europaeus — GLOBEFLOWER
  • Viola species — VIOLA, VIOLET, PANSY

Seeds that Must be Scarified (nicked or filed) before Sowing

  • Baptisa australis — WILD BLUE INDIGO, FALSE INDIGO
  • Hibiscus species — MALLOW
  • Ipomoea — MORNING GLORY
  • Lathyrus species — PERENNIAL and SWEET PEA
  • Lupinus species — LUPINES
  • Glycyrrhiza glabra — LICORCE
  • Calycanthus — SWEET SHRUB
  • Mimosa Linnaeus (Mimosaceae) — MIMOSA

Seeds that Need Cool Temperatures (55ºF) to Germinate

  • Aubrieta deltoidea — FALSE ROCK CRESS, PURPLE ROCK CRESS
  • Cheiranthus Cheiri — WALLFLOWER
  • Dictanmnus albus — GAS PLANT
  • Erigeron species — MIDSUMMER ASTER, FLEABANE
  • Eschscholzia californica — CALIFORNIA POPPY
  • Heuchera sanguinea — CORALBELLS
  • Iberis sempervirens — CANDYTUFT
  • Lathyrus latifolius — PERENNIA PEA
  • Lathyrus odoratus — SWEET PEA
  • Matricaria Menziesii — BABY BLUE EYES
  • Palaver species — POPPY
  • Pentemom hybrids — BEARD-TONGUE
  • Phlox Drummondii — ANNUAL PHLOX
  • Rosmarius officinalis — ROSEMARY
  • Thymus species — THYME, MOTHER OF THYME

Seeds that Need Warm Temperatures (80ºF) to Germinate

  • Capsicum — PEPPER

Hardy Annuals

(Seeds that may be sown outdoors in early spring as soon as soil can be worked and will not be affected by late spring frosts)

  • Allium Ampelpprasum — LEEK
  • Allium Cepa — ONION
  • Anethum graveolens — DILL
  • Anthriscus Cerefolium — CHERVIL
  • Arctotis species and hybrids — AFRICAN DAISY
  • Beta vulgaris — BEET, SWISS CHARD
  • Borago officialis — BORAGE
  • Brassica species —BROCCOLI, BRUSSELS SPROUTS, CABBAGE, CAULIFLOWER, CHINESE CABBAGE, COLLARDS, KALE, KOHLRABI, MUSTARD, TURNIP
  • Centaurea Cyanus — BACHELOR’S BUTTON, CORNFLOWER
  • Consolida ambigua — LARKSPUR
  • Coriandrum sativum — CORIANDER (CILANTRO)
  • Daucus Carota var. sativus — CARROT
  • Eruca vesicaria — ROCKET
  • Eschscholzia californica — CALIFORNIA POPPY
  • Gypsophila species — BABY’S BREATH
  • Latuca sativa — LETTUCE
  • Lepidium sativum — GARDEN CRESS
  • Lobularia maritim — SWEET ALYSSUM
  • Machaeranthera tanacetifolia — TAHOKA DAISY
  • Matricaria recutita — CHAMOMILE
  • Mentzelia Menziessii — BABY BLUE EYES
  • Origanum Majorana — MARJORAM
  • Pastinaca sativa — PARSNIPS
  • Petroselinum crispum — PARSLEY
  • Phlox Drummondii — ANNUAL PHLOX
  • Pisum sativum — PEA
  • Raphanus sativus — RADISH
  • Reseda odorata — MIGNONETTE
  • Spinacia oleracea — SPINACH

Seedlings that Resent Transplanting (Note: For Soil based; Rockwool starts should transfer okay)

(Sow seeds where they are to grow or in individual pots)

  • Anethum graveolens — DILL
  • Anthriscus Cerefolium — CHERVIL
  • Beta vulgaris — SWISS CHARD, BEET
  • Borage officinalis — BORAGE
  • Brassica species — MUSTARD, RUTABAGA, TURNIP
  • Carum Carvi — CARAWAY
  • Coriandrum sativum — CORIANDER (CILANTRO)
  • Daucus Carota — CARROT
  • Eruca vesicaria — ROCKET
  • Eschscholozia califfornica — CALIFORNIA POPPY
  • Foeniculum species — FENNEL
  • Lavatera hybrids — TREE MALLOW
  • Linum species — FLAX
  • Lupines species — LUPINE
  • Nigella damascena — LOVE-IN-A-MIST
  • Palaver species — POPPY
  • Pastinaca sativa — PARSNIP
  • Petroselinum crispum — PARSLEY
  • Phlox Drummondii — ANNUAL PHLOX
  • Pimpinella Anisum — ANISE
  • Pisum sativum — PEA
  • Sanvitalia procumbens — CREEPING ZINNIA
  • Sesamum indicum — SESAME
  • Spinacia oleracea — SPINACH
  • Trachymene coerulea — BLUE LACE FLOWER
  • Tropaeolum majus — NASTURTIUM
  • Zea Mays — CORN

Seeds that Should be Sown as Soon as Possible

(They are not long-lived and should not be stored)

  • Angelica Archangelica — ANGELICA
  • Chrysanthemum coccineum — PYRETHERUM, PAINTED DAISY
  • Delphinium species — DELPHINIUM
  • Dimorphotheca sinata — CAPE MARIGOLD
  • Geranium sanguineum — CRANESBILL
  • Gerbera Jamesonii hybrids — TRANSVAAL DAISY
  • Kochia scoparia — BURNING BUSH
  • Salvia splendens — SCARLET SAGE

Seeds That Will Germinate With or Without Exposure to Light

  • Lobularia maritima — Alyssum
  • Asteris — Aster
  • Cole sata — Cole Crops
  • Celosia cristata — Celosia
  • Cosmos bipinnatus — Cosmos
  • Cucumis — Cucumbers
  • Dianthus caryophyllus — Dianthus
  • Solanum melongena— Eggplant
  • Pingit vaccinia caltha — Marigold
  • Cucumis — Melons
  • Piperis — Pepper
  • Cucurbita — Squash
  • Solanum lycopersicum — Tomato
  • Zinnia elegans — Zinnia

 

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Tips for Hydroponic, Aquaponic, and Soil-based Gardening Methods

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