Cincinnati Gardening Made Easy!
This week, we are answering your spring garden questions.
“What’s the frost-free date for Cincinnati?”
Around May 15th, give or take a month or so! Frost free dates mean your chances of having a frost are 50% or less, and getting less each day afterward. Our wacky weather is so hard to figure out any more. We could go from here and not see any more frosts. I doubt it, but it has happened. But we still look at early to mid-May. By the way, remember it’s not all about just the air temperatures. Soil temperatures mean a lot as well when planting annuals.
“How do I know when to prune my hydrangeas without messing with their flowers?”
Pruning hydrangeas can get confusing as some flower on new growth, some on last year’s growth, and some on both. As a general rule to protect flowering, arborescens and paniculata selections flower on new growth, so prune in spring. Macrophylla, serrate, and quercifolia generally flower on old wood, so clean up deadwood after the winter and deadhead spent flowers as needed, leaving previous year’s growth. Some newer selections flower on old and new growth, but still try to maintain the old growth as best you can. Climbing hydrangeas flower on old wood, so prune after flowering as needed.
“I need to clean up the weeds in a shade garden. Do I need to remove my good plants and then spray with Roundup?”
Nope, as long as you can spray the weeds without spraying your good plants. Roundup only kills what you spray it on and does not spread through the soil. Spray on non-windy days and be precise when spraying. If you get Roundup on something you don’t want to kill, immediately rinse the foliage with plain water.
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