Answer: You're on the right track with your seed starting. Using regular plastic wrap is fine on the seedling trays until they germinate. Some seedlings need refrigeratation if you're saving them from last year. Most seeds you mentioned and buy fresh each year don't unless they say so on the packet. Many of the seeds you mentioned such as sweet peas, cosmos, runner beans and basil can be direct sow into the garden without starting indoors. The Dame rocket should come back again this year and hopefully bloom. Unfortunately, your sweet peas want to grow up not down, so plant that at the bottom of the fence.
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