Answer: You won't be able to grow lavender as a perennial in your zone 4 garden. Lavender 'Lady' is the only variety I know of that is even marginally hardy in zone 5. <br><br>I would start some seeds indoors. I'd start them in large pots--at least 6" in diameter. Once they are up and growing, thin to about 3 seedlings per pot. As they grow larger, you may want to transplant them to one per pot.<br><br>Once the weather warms in the spring, you can begin to harden off the seedlings, bringing them outdoors for an hour or two the first day, working up to all day in about a week. Then, sink the pots right in the garden soil. You can then have them growing where you'd like, and you'll be able to easily pull up the pots in the fall, to overwinter indoors on a sunny windowsill.<br><br>Lavender demands very well drained soil, and excellent air circulation, so space plants generously.
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