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Published May 12, 2009, 06:45 PM

Enjoy the rewards of gardening in May

ST. PAUL – May is a busy month with lots of gardening fun to be had. After a long, cold winter, the excitement of getting out and enjoying our gardens feels like a reward.

By: By Michelle Grabowski and David C. Zlesak,

ST. PAUL – May is a busy month with lots of gardening fun to be had. After a long, cold winter, the excitement of getting out and enjoying our gardens feels like a reward.

Enjoy the many spring flowering shrubs (bridal wreath spirea, forsythia, lilacs, flowering almonds, etc.) and wait to prune them, if necessary, until after they are done flowering. Pruning them before they flower would ultimately benefit the plants because they wouldn’t be investing their stored energy in new growth that would soon be cut off. However, after waiting this long for those beautiful flowers we don’t want to miss them.

New growth is starting on most of our herbaceous perennials. If one hasn’t cut back last year’s stems, now is a great time to do so before the new growth gets larger and interferes with removing the old growth. Come spring, last year’s stems tend to be more brittle and tend to be easier to remove than last fall. Many times pushing them a bit from side to side will allow them to cleanly snap at the base of the plant without even needing to physically cut them.

Continue to plant your cool-season vegetable crops. This includes direct seeding of peas, spinach and lettuce and planting of onion and cole crop (broccoli, cabbage, cauliflower, etc.) transplants.

There are many different onion varieties on the market. Look for are those that are long-day adapted varieties. These develop and invest their energy into their bulbs as the days are long, like we experience in our Minnesota summers. There are also short-day onion varieties that bulk up as the days get shorter. These typically do not perform that great here in Minnesota because by the time the days get shorter in fall the growing season is close to its end.

Many of the onion sets we find for sale in stores are short-day varieties. They will grow somewhat in size after we plant them here in Minnesota, but do not compare to the growth potential of adapted long-day varieties. Many garden centers have little packs of seedlings of adapted long-day varieties. Such varieties include: Walla Walla, Mars, and Ailsa Craig.

Want more seasonal gardening tips, plant recommendations and links to Master Gardener resources and horticulture workshop information? Visit the Garden Info page on the University of Minnesota Extension website at http://www.extension.umn.edu/gardeninfo/.

Michelle Grabowski and David C. Zlesak are horticulturists with University of Minnesota Extension.

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