Flower seedlings, whether you purchase them from a nursery or grow them yourself, require proper care in order to reach a healthy and beautiful maturity. Most seedlings require more care than they will as mature flowers. Seedlings are more prone to fungal diseases caused from overwatering and improper lighting. They are also more susceptible to temperature variations. Seedlings already planted in the garden bed have the same care requirements as those started indoor or purchased from nurseries.
Place seedlings in an area that receives the proper amount of sunlight for the flower type. Most seedlings require at least eight hours of sunlight, which is available in most south-facing windows. Alternately, place the seedlings 4 inches below a grow light fixture and leave the lights on for 12 hours a day.
Set seedlings in an area that isn't prone to air drafts from vents or open windows and doors. Air drafts cause temperature fluctuations and may also dry the soil out quickly.
Provide the proper temperature range for the flower seedlings, which is 65 to 75 degrees Fahrenheit for most flower varieties. Set seedlings far enough away from windows so they do not touch the glass. Warm glass can burn the foliage while freezing glass can freeze and damage seedlings. Cover outdoor seedlings with a cloche if temperatures drop below freezing, but remove the covering once temperatures warm so the plants don't burn.
Water seedlings when the soil surface begins to feel dry, usually every three to five days. Water until the excess moisture drains from the bottom of the pots, or until the garden bed feels moist to a 6-inch depth. Empty drip trays under pots after watering so the seedlings do not sit in the standing water.
Fertilize seedlings every two weeks beginning when the plants are two weeks old. Apply a soluble, balanced fertilizer at 1/4 the rate recommended on the package every two weeks until the plants are transplanted to the bed. Fertilize bedding plants at the rate recommended for the flower variety.