Answer: Some plants do best if sown directly in the soil. These include: roots crops, e.g., beets, carrots, turnips, green onions; greens, such as lettuces, spinach, mustard greens, many herbs, e.g., parsley, basil, cilantro. Squash, peas, beans, celery also prefer direct sowing. (No, celery grows up--isn't gardening fun?)
Other plants do better if started early and then transplanted. Tomatoes, peppers, eggplant and many of the cruciferous vegetables (e.g., broccoli, cabbage, brussel sprouts). This doesn't mean that they won't grow from seed in the garden, but if you start them early inside, they will have a jump start on the growing season and can complete their life cycle before the fall frost. Determine your area's last spring frost date and then work back 6-8 weeks from that to start seeds indoors.
I think you have some nice variety going this year. Some other plants that have fairly quick growing seasons, would be radishes and lettuces. Some of the mesclun mixes with several varieties of greens are fun to try! Good luck and feel free to write with more questions.
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