All seedlings in each tray should have the same watering requirements and planting times for ease of maintenance.If more than one seed germinates, thin out the weakest, leaving only one seedling in each section. Sow two or three seeds in each compartment to compensate for poor germination.Plastic seed starting tray with tomato seedlings Seed tray use tips These features can be particularly useful if you are starting seeds in colder climates and want to extend your growing season. Others have adjustable vents that allow for temperature and humidity control. Seed trays with clear plastic lids act as mini-greenhouses, creating a moist and warm environment ideal for germination. Some have high domes that allow seedlings to grow to 3 or 4 inches tall. The plainest version of this starting tray looks something like a casserole dish. The plastic cover or dome fits over the top of the starting tray. Seed trays with clear plastic covers provide extra climate control at the germianitng stage. The seedlings are watered indirectly – water put in the bottom tray is pulled up into the starting tray. An outer tray without drainable holes fit into the bottom of the starting tray. Self-watering seed trays have drainage holes and capillary matting. Seedlings grown in open trays or flats often need thinning so that individual seedlings can grow on without competion from neighboring seedlings. They can be used for starting very small seeds that can be broadcast or scattered across the the starting medium surface. Flats are often 6 to 12 inches wide and 12 to 24 inches long. Open trays or flats do not have individual cells. Some are designed especially to fit onto windowsills, called windowsill sets. Sometimes sold with plastic trays that they fit beneath the setioned tray to catch water that drips through. Sectioned fiber seed trayĬompressed paper fiber or peat trays are similar in size and depth to plastic trays. Some have flexible bottoms that allow rooted seedlings to be pushed out of the tray from the bottom. Plastic trays can be very thin and light or heavier. Lightweight plastic tray divided into separate cells usually 2 to 3 inches deep and up to 3 inches square or round. Open flat trays, on the other hand, are versatile and can accommodate seeds of various sizes, allowing for greater flexibility. Multi-cell trays are perfect for smaller seeds or plants that can be closely spaced, as they provide multiple compartments in which to sow your seeds. Individual cell trays are ideal for larger seeds or plants that require ample space, as each cell provides enough room for seedlings to develop. There are various types available, including individual cell trays, multi-cell trays, and open flat trays. Choose a seed tray that suits your specific needs.
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