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I am plotting and planning and placing orders for onion sets and seed potatoes and summer crops that will be directly seeded in the garden once the temperatures really warm. I can barely stand the wait!
I have two trays of seedlings that I started about 2 weeks ago and have begun another round of kale, broccoli and Brussels sprouts in 3 more trays.
My setup is not elaborate. It basically consists of a kit that includes a plastic dome that fits over a seed tray and pan.
You can craft your own using shallow containers (or a shallow flat with drainage holes, like you would get if you bought a flat of pansies), fill the flat with sterile growing medium like a 50-50 mix of vermiculite and peat moss and then top it off with some clear plastic.
Of course, you need to plant some seed at some point. Here’s how:
Seeds need varying degrees of warmth to germinate, so for cool-season crops you may not need any more heat then what a sunny window or some grow lights will provide. Summer crops will benefit from an additional source like a heating mat.
You don’t want to cook your seeds. Just keep them on the warm side. It is not ideal to put them by a heat register or refrigerator because this is an inconsistent source of warmth and dries the seedlings out.
If your tray is in a bright window, you will need to rotate the tray daily once the seedling emerge; grow lights overhead are ideal because the seedlings grow stout and straight.
Once your seedlings emerge, remove the covering and begin to water the tray from the bottom to maintain even moisture (not soggy).
Once the second set of true leaves form (those that are the shape that you associate with the plant), your adolescent seedlings are ready to be transplanted into their own pot containing transplant mix. You can use small pots left over from store-bought plants.
Once they are transplanted return them to their light source (if they are in a window give them a quarter turn every day so they grow straight). Continue to water your transplants from the bottom when needed, adding some diluted fish emulsion fertilizer once a week.
When conditions are right for your particular plant (check the seed package for details), acclimate them to the outdoors before planting them in the garden. Put them outside in the shade, first, gradually moving them into the sunlight.
They will be ready to plant in the garden in about a week.