What zone are we in?
ZONE 6 Northeast
(MA, ME, NH, VT, NJ, NY)
The biggest question - When should I start my seeds indoors?
That depends on the type of seeds and the last expected frost date. The last expected frost date for Zone 6 is April 30 - May 30. For example; you should start broccoli 3-4 weeks before last frost. Count back 4 weeks from April 30th to April 2, is when you should start your seeds. On the other hand, Italian Roma tomatoes should be started 6-8 weeks from the last frost, putting the seed starting date to March 13. Generly speaking, around our area the last frost isn't until some time in May. So don't worry, there is still plenty of time to start your seeds.
Lets get started. . .
Soil
1) Place potting mix into your container(s) filling to the top. You may want to dampen your mix to ensure complete wetness before you add your seed(s). Make sure the soil is the consistency of a damp sponge. Do not pack the soil mix into the container, just tap the container lightly to settle the mix.
Planting
2) Make sure you read the package of your seeds for special instructions. Some seeds may need overnight soaking, such as Morning Glories. A Good rule of thumb, would be to plant 3 seeds per container. Not all the seeds will germinate, and those that do may not survive. If all 3 seeds survive you can thin them to their own containers later
Watering
3) After you have planted your seeds, water with a fine spray mist. If you used pre-moistened soil, it is still a good idea to sprinkle some additional water on top of the newly planted seed. Do not saturate.
Greenhouse
4) If you have not bought a greenhouse kit complete with container, peat pellets, and cover, then you need to cover your containers loosely with some type of plastic. Covering your containers will help produce heat and moisture that your seedlings need in order to germinate. You can use plastic wrap, or plastic bags.
Heat - you need to have your containers in a warm area where the temperature is between 65-70 degrees. Using heating mats is a great way to insure the right consistent temperature. If using heating mats you will need to water more frequently.
Air - Air needs to be circulated under the plastic to guard against mold.
Signs of Growth/Light
5) At the first sign of the seedling emerging, remove the plastic and put the plant(s) into indirect light. Make sure the soil is moist, not wet. Your seedlings will need between 12 - 18 hours of light each day.
Fertilizer
6) Once the seedling takes form you will need to give it some food. Use a balanced fertilizer or one high in nitrogen and potassium, to encourage good roots and healthy growth.
Potting Up
7) Seedlings can remain in their original containers until you are ready to plant them outside. It is common to transplant, "Potting Up", the seedling when it is a couple of inches tall to a bigger container. This will allow the plant to develop a stronger root system. Use a 3 - 4 inch pot. Biodegradable pots are easy to use and safer for the environment. Remeber to keep the soil moist.
Thinning
8) If more than one seedling is growing in the same pot, you can separate them into individual pots, or you can cut off the weakest one.
Hardening Off
9) Before you plant you seedlings outside you need to get them ready for the great outdoors; this is called Hardening Off. You need to introduce them little by little to the outside temperature. Using a cold frame is the best way to introduce them. If you don't have a cold frame, put them in a shady area in your yard for short periods of time each day, gradually introducing them to sunlight. Each day increase the time until you notice that your new plants looks healthy and are ready to stand on their own.
Good Luck!