The May/June issue of Northern Gardener will be arriving in mailboxes and at news stands soon. This is our biggest issue of the year and includes articles on several hot trends in gardening. Margaret Haapoja writes about tropical plants, including plants that are hardy to the North (Margaret lives near Duluth) but look like they’re from south Florida. Don Engebretson, the Renegade Gardener, has an interesting column on using perennials in containers. While petunias, impatiens and begonias are great, this is the year to try something different. Don offers several suggestions for using perennials with unusual foliage, and he tells us how to keep those plants through the winter to use in containers next year as well. Look for the pale blue banner and the striking passionflower vine on the cover.