It’s time to start on your garden.
Sow slow-germinating small seeds inside in late February through March. These include begonia, celery, impatient, petunia, snapdragon, etc. These small seed plants are not only slow to germinate but slow to grow.
Wait until March to sow larger seeded plants. Broccoli, cabbage, Chinese cabbage, cauliflower, kohlrabi and pac choi should be sown so that the plants will be tall enough to transplant into the garden in early to mid-April while temperatures are cool. The seeds of these plants also germinate and grow best in cooler temperatures. To prevent sunscald, acclimate the plants by placing them in trays outdoors under light shade for at least a week before transplanting them into the garden.
What’s Next for Forced Bulbs?
Q My forced bulbs, amaryllis and paperwhites, have finished flowering. What can I do to bring them back next year?
–Sandra Olivetti Martin
A Are the bulbs in gravel or in soil in pots? If they are in gravel, plant them in a mix of half potting soil-half compost, put them near a window facing south and keep them growing until you can plant them outdoors in full sun come spring. In soil, give them some liquid fertilizer. Next fall after the leaves have died back, dig up the bulbs, plant them in pots, place them near the foundation of the house on the north side and mulch heavily with leaves held in place with chicken wire. Near early December, bring in a few pots of potted bulbs and start forcing them. Do not fertilize them again until they have flowered.
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Because seeds of peppers, both hot and sweet, are slow to germinate, they should be sown in March, under 80-degree temperatures. Pepper seeds require two to three weeks to germinate and seedlings are slow to grow initially.
Seeds of tomatoes, calendula, gazania, gaillardia, marigold, sunflower and zinnia germinate rapidly, and the seedlings also develop rapidly. Seeds of these species can be delayed five or six weeks before they are transplanted into the garden. This prevents the seedlings from becoming root bound, which will permanently stunt their growth. If you want to grow extra large plants, start them in five- and six-inch containers.
Many seed catalogs publish seeding schedules, but you must know your climate zone and growing conditions, such as growing in a cool or heated greenhouse or on the window sill. The heated greenhouse in full sun provides the ideal growing condition, while the window sill is the least desirable situation for growing plants, especially those that require full sun.
If you are growing plants on a window sill, rotate them daily (weekly if that’s the best you can do) to prevent them from leaning toward the light. Follow the same rule if you have a lean-to greenhouse that faces south.