Posted on Tuesday, November 01, 2005 - 10:25 am EST :
Silvia, I don't think it's a good idea to leave your lavender in the windowboxes. The roots get pretty large if they're typical lavender plants. I'd definitely plant them directly in the ground. Here's a website that may help. http://www.growing-lavender.com/Sunnyday2day- Michigan, Zone "5"