Anyone who lives on Cape Cod will tell you: it seems as if it's been cloudy and damp forever. Our plants are longing for the sun, and many of them are prone to all sorts of fungal or rust problems in this weather. Blackspot on roses, mildew on squash and rust on the hollyhocks are all likely to show up soon. Yikes!
Two products offer protection or treatment for these problems: Serenade and GreenCure. Both are approved for organic gardening, so they may be safely used on edible plants as well as your ornamentals. Serenade contains Bacillus subtilis, a natural microorginism that has been used for years to suppress fungi and rusts. GreenCure is made of potassium bicarbonate with a spreader-sticker added to hold the product on the plants. The potassium bicarbonate kills existing mildew and helps to prevent new outbreaks.
This gardener has used Serenade to keep the rust on her hollyhocks at bay: if you've had a problem with hollyhock rust, start to spray early next year and be sure to coat the stems and underneath the leaves.
These products, like all fungicides, should be applied according to directions and are most effective when used before the plants have a problem. So this year use them as soon as possible, but next year begin to spray as soon as the plants break dormancy.
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