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Chickies11
Songster
Thank you for all your help! Especially explaining the "big three" in the fertilizer, I was confused about that before. I will probably add a pepper plant in my bed, like you said.Compost is rotted vegetable matter, sometimes mixed with animal manure. Think of what is going on under trees in the forest. The leaves fall, break down, become soil, feed the trees and other plants. Compost is a HUGE subject all by itself.
Fertilizer is stuff to supply nutrients to feed plants. It can be strictly chemical or made from organic ingredients. You'll usually see three numbers, like 10-10-10. The numbers represent amounts of the "big three" nutrients plants need: Nitrogen, Phosphorous, and Potassium, always in that order. (Sometimes abbreviated NPK, those elements' chemical symbols.)
Plants need more than just NPK, just like people need more than fat, protein, and carbohydrates. Compost can help supply NPK, and other nutrients. It can function as a fertilizer; indeed, it does in the forest example above.
Look online to find the average last frost date for your location. Tomatoes and peppers will be killed by a light frost. They are not at all "frost tolerant." Wait about a week after your last frost day to plant them. Lettuce is totally different. It can be planted before your last frost date. It might grow very slowly, but a light frost won't hurt it.
Tomatoes: Determinate tomatoes ripen their tomatoes pretty much all at once. This is handy if you're canning them. After that, the plant usually dies. Indeterminate tomatoes keep growing, flowering, and producing fruit until they are killed by a frost. The plants can get HUGE. Mine have gotten so big that the tomato cage falls over from the weight. I would give your indeterminate variety a little more room than the other two.
Peppers are fairly compact plants. I think you could fit four plants in your pepper bed.
Lettuce is only big and bushy when it's full grown, and usually then it's getting too old to eat. I scatter lettuce seed over the whole area (row or bed) and thin out the seedlings as they get crowded. They are delicious at that size too; very tender.