You should have started indoor tomatoes in Feb for zone 6, I would wait and buy plants late April ,early May. Peas, including ornamental sweet peas now. Dill now, any flowering seeds that need stratification now(cleome, morning glories, etc). Onion sets, carrots, radishes now and potatoes anytime soon. Good luck...suggestion:buy a gardening book, or check one out at your local library for zone 6. I research like crazy,,then experiment. I live in zone 6, but sometimes can get away with zone 5 plants.

I grew clary sage from seed... after the last frost. I don't have frost, but after the last frost is good. I'd buy a young plant in the spring if I were you, unless your main goal is to get the flowers, then you could purchase one now and over winter it. It's pretty easy to grow from seed, just press the seed into the soil, keep moist and 1 to 2 weeks later you will have a baby! hope that answers your questions.

sorry I didn't see this sooner. I agree, Eliot Coleman's books are great plus you can see his posts on Facebook about what he is doing in his high tunnel. A local market farmers also posts his photos and sells fresh veggies at the winter market here in zone 5B NH. I have a greenhouse plastic covered wood frame high tunnel. The ground never freezes inside but the air temps as mentioned by another poster get just as cold inside as outside when the sun goes down. We have a thermometer in our kitchen with sensors in different places so I know what the temp is in the high tunnel as well as outdoors. There are some easy tricks to keeping things warm like putting Agribon fabric over plants. Some of the market gardeners are using supplemental heat early in the season to get an early start on tomatoes. Johnny's Selected Seeds website has some good info about high tunnels. Yes, you can plant cold hardy things earlier but you also have to know that there is a Persiphone period during winter when there is not enough sun so plants go dormant. My simply plastic high tunnel seems capable of being a zone or two warmer depending on how much extra protection I give things. I overwintered rosemary and variegated sages successfully (but not last winter). I'm planting in the ground. Cilantro, kale, claytonia self seed in my high tunnel but not outside. I don't think beans are cold tolerant. Spinach and chard are. I had a goal of picking salad greens for Thanksgiving dinner. I might have done Christmas, too. You will need to read up on varieties because some lettuce is hardier than other varieties. I have had some lettuce start regrowing in early spring. Surprisingly, even with the sides rolled up and double door open, in summer the temp is easily 100 degrees on sunny days. In winter there can be a huge temperature difference. I have a yard hydrant so I can have water in winter but that requires an underground pipe from the house. My tomato plants are healthier than those growing outdoors. I still start seed indoors under lights. Between Johnny's and Eliot Coleman's books you can figure when to plant seeds outdoors under plastic to provide fall and winter harvests. I did not do winter crops this past winter because voles and other furry creatures had caused too much damage. Went to undercover a late crop of broccoli only to find every head gone. Also be aware that it gets too hot to be working under plastic in the summer and even some spring days if you don't get out early.

Frances, Too early is when the ground is still solidly frozen. You'll break your back and shovel both then. The second time, is when It is too early in the AM, as before sunrise, when the street lights are still on. In the dark you will need someone to hold your lantern or flashlight, and any early rising or shift working neighbors who might see you, could call the cops. All kidding aside, this is the ideal time to move roses, when they are dormant. Get your new location hole dug first. Then dig your rose, getting as much soil ball as you can. Do it carefully, and your rose in its new home will wake up like nothing happened, not skipping a beat. Treat it like any freshly planted rose bush. Backfill with light, fluffy soil and water in generously. You cannot fail. Moses