Make sure you have a thermometer in the frame to help with this temperature control. You do not want to accidentally cook your plants! There are a wide variety of commercially available ones or you can easily build one yourself. You open and shut the top by varying amounts to help regulate the inside temperature on sunny days. A cold frame is a simple, 4-sided structure built low to the ground, often made of boards or loose concrete blocks, with a moveable, transparent top for letting in sun. If a few inches of soil sticks to the bottom of your shoe when you step in the garden, it is too wet for transplanting.Īnother way to harden off seedlings is by placing them in a cold frame for 7 – 10 days before planting in the garden. One way is by moving the seedlings outdoors to a partially shaded area for a few hours a day then bringing them back indoors afterward, gradually increasing their amount of time outside and sun exposure by 1 – 2 hours each day. Do this for 7 to 10 days and they should be ready to move into the garden, assuming the soil is dry enough. You can accomplish this task a couple of different ways. Once your seedlings have these leaves, it is time to start hardening them off. Hardening off is a process that starts acclimating plants to the more rugged outdoor climate after being pampered inside. You want to see 3 – 4 true leaves before transplanting. This ensures the plant can feed itself after it is transplanted. True leaves resemble the look of the adult leaves whereas cotyledons are simple and nondescript. They sometimes still have the seed coat on their tip as they grow upwards. If the plant has hypogeal germination, as with peas, the seed leaves stay below the soil and you likely will not see them except potentially during transplanting.Ĭotyledons provide the baby seedling with food until the true leaves rise up above them and start making their own food for the plant through photosynthesis. When a seedling sprouts, the first leaves that appear are not “true” leaves, but rather “cotyledons” or seed leaves. Also, before transplanting to the garden, make sure these things happen: you see the first set of true leaves and you harden off the seedlings.Ī “true” leaf is one that can perform photosynthesis, the process plants use to make their own food. NorthamptonĪ: Timing when to transplant seedlings is always a bit tricky, C.H., as it is not an exact science but rather varies with the weather and soil conditions. Our average last frost date is around May 15. Your seed packet should have some helpful planting information on it related to that date. Q: How do I know when I am ready to transplant my vegetable seedlings to my garden outside? My early ones seem about ready.
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