Only January, Yet Already Time to Sow Seeds?

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It’s only January! Surely it’s too soon to sow seeds? Source: worldartsme.com, rdkate.blogspot.ca & mzayat. com

The new year has barely begun, yet now and over the coming month it’s already time to start certain seeds indoors.

This is a very select group of especially slow-to-mature plants. January is far too early for most seeds (think March or April instead), but you need about four to five months of indoor culture to bring the following plants to the right state of growth for outdoor planting.

  1. Agastache (Agastache foeniculum)
  2. Datura (Datura metel)
  3. Fairy Snapdragon (Chaenorrhinum origanifolium, syn. glaerosum)
  4. Lisianthus (Eustoma grandiflora)
  5. Spike dracaena or cabbage palm (Cordyline australis, syn. indivisa)
  6. Tritome (Kniphofia )
  7. Tuberous Begonia (Begonia × tuberhybrida)

No Easy Feat!

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Artificial light is almost essential for seeds started in January. Source: laidbackgardener. blog

Starting seed in January in the Northern Hemisphere is not simple. The days are short, the sun is weak and, in many areas, the weather is gray more often than sunny, meaning light is seriously lacking. Also, temperatures in front of the average windowsill are cool, yet almost all seeds need warmth—and fairly even temperatures—to germinate well. As a result, you pretty much have to start these under artificial lights, such as fluorescent or LED plant lights, and in the warmest part of your home.

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Germinate the seedlings under glass, possibly over a heating pad, as above. Source: www.amazon.fr

Always start winter-sown seeds “under glass” (under some sort of transparent covering) to maintain high humidity and stable temperatures and in a room that is at least moderately warm (72 to 75˚ F/21 to 24˚ C) or place the seed containers on a heating pad (one specifically designed for plants). Use a timer to set the day length of your lamp at 14 hours to simulate the long days of summer and place the containers of freshly sown seeds about 6 to 12 inches (15 to 30 cm) below the lamp. Now, wait patiently for germination to occur. (One reason that certain seeds need early sowing is that they are slow to germinate.)

Seeds That Require a Cold Treatment

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Many tree, shrub and perennial seeds need a cold treatment before they will germinate. Source: laidbackgardener. blog

January (or December or February) is also a good time to start seeds that need a cold treatment (cold stratification) to germinate well. This group includes most trees and shrubs from cold and temperate climates, but also many perennials and even a few annuals.

These seeds will not germinate until they have received a given number of days of cool, moist conditions, from as little as one or two weeks to four months or more, information you would (hopefully) find on the seed pack.

The number of weeks given is the minimum requirement for that species, but there is no maximum. So, if you keep seeds that need, say, a two-week treatment in the cold for two months, that’s not a problem. That’s nice to know, because the information on the minimum cold treatment for seed X is not always available, especially for seed you harvested yourself. If you don’t know, I suggest giving seeds of perennials a six to eight-week cold treatment: that’s usually enough. For trees and shrubs, I’d recommend three months.

Simply sow these seeds in a container as you would any other, then seal them inside a clear plastic bag and pop them into the refrigerator or cold room for at least the minimum number of weeks. Afterwards, move them to a warm, well-lit spot, on a windowsill or under lights, for germination to start.

100 Seeds That Need a Cold Treatment

Here are 100 plants that germinate best with a cold treatment (there are thousands of others!). Check the seed envelope or the seed supplier’s web site for more information.

  1. Abies (fir)
  2. Acer (maple, mosts species)
  3. Aconitum (aconite)
  4. Alchemilla (lady’s mantle)
  5. Allium (ornemental onion)
  6. Amelanchier (serviceberry)
  7. Aquilegia (columbine)
  8. Asclepias (milkweed, some species)
  9. Astrantia (masterwort)
  10. Baptisia (false indigo)
  11. Buddleia (butterfly bush)
  12. Caltha (marsh marigold)
  13. Caryopteris (bluebeard)
  14. Cercis canadensis (redbud)
  15. Chelone (turtlehead)
  16. Cimicifuga (bugbane)
  17. Clematis (clematis)
  18. Cornus (dogwood)
  19. Corydalis (fumitory)
  20. Delphinium (delphinium)
  21. Dicentra spectabilis, now Lamprocapnos spectabilis (bleeding heart)
  22. Dictamnus (gas plant)
  23. Dodecatheon (shooting star)
  24. Echinacea (purple coneflower)
  25. Eremurus (foxtail lily)
  26. Eryngium (sea holly)
  27. Eupatorium (Joe Pye weed)
  28. Filipendula (meadowsweet)
  29. Forsythia (forsythia)
  30. Fragaria (strawberry)
  31. Fuchsia (fuchsia)
  32. Gentiana (gentian)
  33. Geranium (perennial geranium, cranesbill)
  34. Goniolimon (German statice)
  35. Helianthemum (rock rose)
  36. Helianthus (perennial sunflower)
  37. Heliopsis (false sunflower)
  38. Helleborus (Christmas rose)
  39. Hemerocallis (daylily)
  40. Heuchera (coral bells)
  41. Hibiscus moscheutos (perennial hibiscus)
  42. Hypericum (St. John’s wort)
  43. Iberis (perennial candytuft)
  44. Ilex* (holly)
  45. Incarvillea (hardy gloxinia)
  46. Iris (iris, many species)
  47. Kirengeshoma (waxbells)
  48. Knautia (knautia)
  49. Lathyrus (perennial sweet pea)
  50. Lavandula (lavender)
  51. Leontopodium (edelweiss)
  52. Lobelia (hardy lobelia)
  53. Lonicera (honeysuckle)
  54. Macleaya (plume poppy)
  55. Magnolia* (magnolia)
  56. Malus (apple, crabapple)
  57. Mazus (creeping mazus)
  58. Mertensia (Virginia bluebells)
  59. Muscari (grape hyacinth)
  60. Myrrhis odorata (sweet cicely)
  61. Nepeta (catmint)
  62. Oenothera (evening Primrose)
  63. Opuntia* (beavertail cactus)
  64. Paeonia* (pivoine)
  65. Penstemon (beard-tongue)
  66. Persicaria (fleeceflower)
  67. Persicaria orientalis, syn. Polygonum orientale (kiss-me-over-the-garden-gate)
  68. Phlox (phlox)
  69. Physalis (Chinese lantern)
  70. Picea (spruce)
  71. Platycodon (balloon flower)
  72. Primula (primrose)
  73. Pulsatilla (pasque flower)
  74. Quercus (red and black oaks)
  75. Ranunculus (buttercup)
  76. Ratibida (prairie coneflower)
  77. Rosa (rose)
  78. Rudbeckia (black-eyed Susan)
  79. Sambucus (elderberry)
  80. Sanguinaria (bloodroot)
  81. Sanguisorba (burnet)
  82. Saponaria (soapwort)
  83. Saxifraga (saxifrage)
  84. Scabiosa (pincushion flower)
  85. Sedum (stonecrop)
  86. Sempervivum (houseleek)
  87. Sidalcea (prairie mallow)
  88. Staphylea* (bladdernut)
  89. Stokesia (Stokes’ aster)
  90. Syringa (lilac)
  91. Thalictrum (meadow-rue)
  92. Tiarella (foamflower)
  93. Tricyrtis (toad-lily)
  94. Trillium* (trillium)
  95. Trollius (globeflower)
  96. Tsuga (hemlock)
  97. Vernonia (ironweed)
  98. Veronica (speedwell)
  99. Viola (violets)
  100. Vitis (grape, some species)
*Some species in this genus require a double cold stratification: that is, two cold treatments separated by warm one, to germinate well. Try two to three months of cold followed by two months of warmth, then again two to three months of cold. When you expose them to warmth after these repeated treatments, most will germinate quite readily.

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Perennial Doesn’t Mean Eternal

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Gaillardia is beautiful, easy to grow… and very short-lived: 2 or 3 years.

If you’re tearing out your annuals because they bloom only once and replacing them with perennials “because they live forever”, you may be making a mistake. Perennials (planted in appropriate conditions, of course) do live longer than annuals (1 year) and biennials (2 years), but not always that much longer. Some perennials live only 2 or 3 years, others twice that, others a little more, but very few will still be around in 40 years! If I had to estimate the average lifespan of a perennial, I would say 7-8 years.

This is much better than an annual, but you must still be ready to replace perennials from time to time: for the most part, they are not as long-lived as woody plants (trees, shrubs and conifers) most of which will probably outlive the person who planted them.

Short-lived Perennials

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Columbine (Aquilegia) is a short-lived perennial.

There is a particular group of perennials gardeners call short-lived perennials. They’re not exactly biennial, as the latter only bloom once, the second year, then die. Short-lived perennials have the ability to bloom more than once, but often flower the first and second years before they croak. The third year remains a question mark and as for the fourth… forget it!

The problem for the novice gardener is perennials don’t come with a “I’m beautiful but short-lived” label. When a “perennial” disappears after only 2 or 3 years, the disappointed gardener feels guilty and wonders what he did wrong. Yet disappearing after 2 or 3 years is normal for these plants: it’s not your fault.

When you know in advance that a perennial is short-lived, you can take precautions to prolong its existence. For example, taking cuttings ou divisions or multiplying it by seed. If you do this every two years, your short-lived perennial can return year after year.

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Mauves (Malva spp.) are short-lived, but generally maintain themselves through self-sowing.

Many of these short-lived perennials redeem themselves, at least partly, by reseeding spontaneously. Okay, they don’t grow back exactly where you wanted them, but if you are open to the concept of an English-style mixed border, where plants mix freely, you may come to find these ephemeral beauties very interesting. And what a joy they can be for the laidback gardener: they require no care whatsoever, showing up here and there as if by magic!

Although they may not live forever, short-lived perennials still have an advantage over their long-lived cousins: they generally bloom profusely the first year you plant them (many indeed will even bloom the first year from seed if you sow them indoors in early spring), which is certainly not the case of most long-lived perennials, most of which take at least 3 years before giving their best show.

A Few Short-lived Perennials

Here is a list of perennials that are generally short-lived. Those marked with an asterisk (*) tend nevertheless to come back year after year by self-sowing.

  1. Agastache (Agastache spp.) (some species self-sow*)
  2. Baby’s Breath (Gypsophila paniculata)
  3. Blanket Flower (Gaillardia x grandiflora)*
  4. Blue vervaine (Verbena hastata)*
  5. Blue-eyed grass (Sisyrhynchium angustifolium)*
  6. Brown-eyed Susan (Rudbeckia trilobata)*
  7. Cardinal flower (Lobelia cardinalis)
  8. Columbine (Aquilegia spp.)*
  9. Coral Bells (Heuchera spp.) (some cultivars are short-lived)
  10. Dame’s rocket (Hesperis matronalis)*
  11. Delphinium (Delphinium spp.) (longer-lived in cool climates)
  12. Echinacea (Echinacea spp.) (some cultivars are short-lived)
  13. English daisy (Bellis perennis)
  14. Garden mum (Chrysanthemum x morifolium) (some newer cultivars are long-lived)
  15. Gloriosa daisy or black-eyed Susan (Rudbeckia hirta)*
  16. Hybrid Tulip (Tulipa spp.)
  17. Iceland Poppy (Papaver nudicaule)
  18. Knautia (Knautia spp.)*
  19. Lupine (Lupinus x russellii)
  20. Maltese Cross (Lychnis chalcedonica)*
  21. Mauve (Malva spp.)*
  22. Orange jewelweed (Impatiens capensis)*
  23. Painted Daisy (Tanacetum coccineum)
  24. Perennial Flax (Linum perenne)*
  25. Pincushion Flower (Scabiosa spp.)
  26. Pinks (Dianthus spp.) (some species self-sow)*
  27. Rose campion (Lychnis coronaria)*
  28. Shasta Daisy (Leucanthemum x superbum) (‘Becky’ is long-lived)
  29. Tickseed (Coreopsis grandiflora)
  30. White corydalis (Corydalis ochroleuca, now Pseudofumaria alba)*