This is where an outlet timer comes in handy. Seeds contain all the nutrients they need for their first few weeks. This will make your plants stockier, which will help them better resist real wind and other outdoor elements. It also promotes air circulation around your plants, preventing plant diseases.
By the time your seedlings have a few pairs of leaves, weeding out the competition — that is to say, thinning some of your seedlings with a sharp pair of shears to leave only one plant per rockwool cube — can be wise.
The plants that benefit from thinning typically fall into the heartier, fruiting crop category e. For most herbs and greens, on the other hand, you can usually grow multiples per rockwool cube. But about a week before you do, you should harden off your seedlings.
The process is fairly simple — just expose your seedlings to the outdoors in increments of a few hours every day for a week. So one or two hours the first day, three or four hours the second day, and so on for about seven days.
Learn more about the process here ». Finally, plug your new, happy, hardened seedlings into your Tower Garden and watch their growth explode! You should be closely monitoring your seedlings for signs that something is wrong from the time that you plant the seeds. All Articles of this Author. Want to leave a comment? We'd love to hear it. Please note that all comments are moderated. Anything resembling spam will be deleted.
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Teachers—download lesson plans to use in your classroom! Starting to Grow What does the word "germinate" mean? Prior to germination, cover your container to help trap moisture inside. Seed-starting kits typically come with a plastic cover. Remove covers as soon as seeds sprout.
Keep soil warm. Seeds need warm soil to germinate. They germinate slower, or not at all, in soils that are too cool. Waterproof heating mats, designed specifically for germinating seeds, keep soil at a constant temperature. You can buy them in most nurseries and garden centers. Or, you can place seed trays on top of a refrigerator or other warm appliance until seeds sprout.
Start feeding your seedlings after they develop their second set of true leaves, applying a half-strength liquid fertilizer weekly. Apply it gently so seedlings are not dislodged from the soil. After four weeks, apply full-strength liquid fertilizer every other week until transplanting. Give seedlings enough light. Not enough light leads to leggy, tall seedlings that will struggle once transplanted outdoors.
In mild winter areas, you can grow stocky seedlings in a bright south-facing window. Farther north, even a south-facing window may not provide enough light, especially in the middle of winter.
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