Ask the Expert

Are there plans to update the current USDA plant hardiness zone map?

Question: The new “normal” 1990-2020 temperatures were recently released. Do you have any idea if plans are being made to update the current plant hardiness zone? I live in Portland near the Fore River Estuary. It is definitely a warmer “microclime” even though I can see the runway of the Jetport (5b) from the house. […]

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Do my highbush blueberries have a fungal disease?

Question: I have several blueberry bushes that are developing reddish/purple leaves and berries throughout the summer. This affected the berry bushes last year as well. I am struggling to diagnose the cause and come up with a remedy so I’m hoping to get some guidance. I have had some suspicion of fungal disease and have […]

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How can I keep insects off my hummingbird feeder?

Question: I have a hummingbird feeder which I fill with sugar water. Lately there have been some small bees or wasps (looks like a fly with skinnier wings, maybe a flying ant) eating the food from the feeder. Can you tell me what they are and how I can rid of them safely? Wondering if […]

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What’s wrong with my stone fruit trees and shrubs?

Question: We have quite a few stone fruit trees/shrubs in our yard, including sour cherry bushes, apricots trees, and plum trees. This past spring the blossoms on these shrubs and trees browned, and many of the younger branches died. We only got a fraction of the fruit that we usually do, but the fruit that […]

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What’s eating my young cornstalks?

Question: What is getting into our garden and eating these young cornstalks? Answer: Marjorie Peronto, Extension Educator It looks like damage from a critter, perhaps a woodchuck, who sits on its haunches and eats the stalks, making a mess and leaving evidence.  If you do not have fencing around your garden, I suggest you consider […]

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What’s wrong with my grapes?

Question: My somerset seedless vine (about five years old) now has berries and they are getting some fatal disease. They start with a brown spot, then it progresses to a brown bullseye, then half the berry shrivels, then the whole thing is mummified. I suspect this is black rot, yet again, even after cutting back […]

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Can my saucer magnolia tree be saved?

Question: I purchased a saucer magnolia tree and planted it in early May. At the time of planting there were no leaves or flowers visible but it did have buds. I planted using a blend of 50% original soil which is clay and Coast of Maine penobscot compost blend. The tree started leafing out soon […]

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What’s wrong with my Japanese maple tree?

Question: In a 24 to 48 hour period, some of the leaves on my Japanese maple tree developed dry, brown patches. Leaves that fell to the ground were completely dried-up and crunchy. About 10% of the leaves on the tee were affected. The condition has not worsened since I first noticed the problem a couple […]

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What’s wrong with my bee balm?

Question: Last year, I bought some bee balm from a vendor at the farmers market and planted it. It is growing well, but it has magenta “stains” on the stalks. The lower leaves are turning yellow, and there are some white and yellow spots on some of the upper leaves. The spots eventually turn brown. […]

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Why aren’t any Monarchs coming to my milkweed?

Question: I’ve let milkweed grow in my vegetable garden, which I didn’t take time to plant this year. I pulled out half but left some for monarchs, esp. since our new neighbor keeps the adjacent field mowed, instead of letting all the native plants grow. I thought the monarchs would have arrived by now, but […]

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