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If your vegetable seedlings have been without light and water for a few days, they may be wilted, yellowing, and have stunted growth. However, there are some steps you can take to try and revive them:
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Water the seedlings: Give your seedlings a thorough watering, making sure the soil is well-moistened. It's important not to overwater, as this can lead to other problems such as root rot. If the soil is extremely dry, you may need to water several times, giving the soil a chance to absorb the water each time.
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Give them some light: Seedlings require at least 6 hours of direct sunlight per day or a grow light equivalent. Place the seedlings in a location where they can receive adequate light, but avoid direct sun until they recover. Gradually increase the amount of light over a period of several days.
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Trim off dead or damaged leaves: Remove any dead or damaged leaves on the seedlings with a sharp, clean pair of scissors or pruning shears. This will allow the plant to focus its energy on new growth rather than repairing damaged leaves.
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Consider using a plant growth stimulant: A plant growth stimulant can help stimulate new growth and provide additional nutrients to the plant. However, be sure to follow the instructions on the product carefully to avoid over-fertilizing or causing other problems.
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Be patient: It may take some time for your seedlings to recover, so be patient and continue to provide them with the care they need. With the right care and attention, many seedlings can recover from a period of neglect and go on to produce a bountiful harvest.