Start with cleaning the shelves using 1 part bleach mixed with 9 parts water.
Read eHow for tips on cleaning a small greenhouse:
Sterilize your trays & pots with this same bleach solution. Purchase or make your seedling mix (which is a soil-less mix), gather your plant labels & permanent markers and you’re ready to plant.
Read how to make your own soil-less seedling mix Organic Gardening website: http://organicgardening.about./seedstartingmix.htm
To calculate greenhouse planting start dates, check each seed packet and plant according to the instructions. Count back the weeks needed for seeds to grow and when you want them really for the garden club’s plant sale or to plant in your garden after the last frost. Seeds typically need 8-12 weeks to grow. For example: AGC’s plant sale is May 11 2013, 12 weeks back from May 11th is February 16th, 8 weeks back is March 16th . Check your seed packets for start dates.
Below is a list of flowers you can start in your greenhouse in February: Petunias, Impatiens, Lobelia, Lupine, Echinacea, Rudbeckia, Coreopsis, Salvia, Lavender, Scabies, Delphinium, Pansies, Shasta daisy, Forget-me-nots, Gaillardias, and Nasturtiums.
You can also start: Cabbage, Broccoli, Cauliflower, Brussels Sprouts, Beets, Lettuce, Cilantro and Spinach seeds. It is recommended for larger vegetable seeds, like beets, to soak them 12 to 24 hours before planting.
To begin: fill your sterilized trays with seedling mix, water the seedling mix thoroughly, and then let them sit until the next day to warm up. On day two, plant your seeds, mark your trays/pots, then water them in.
Seeds need warmth to germinate. Check out Heirloom Seeds’ website showing seed germination/soil temperatures:
You can provide warmth with heating mats (available at garden supply stores) which sit under your seed trays or you can warm your greenhouse with a portable heater.
Some seeds also need light to germinate, so place trays a few inches below a grow light or a florescent light, and keep the lights on 24 hours a day.
After the plants have developed several sets of true leaves, transplant them into sterilized pots with a good garden variety potting soil. To avoid transplant shock water them in with a B1 solution; B1 is available at garden stores. Once plants are established in their new pots, fertilize them once a week with a 1/4-strength water-soluble fertilizer. During the rest of the time use plain water; keep the seedlings moist, but not wet. Keep plants under the lights, keep them warm and watch them grow!
By: Carlotta Lucas & Melody Jones