Uh-oh! I was pulling an odd weed here and there in my heath bed and came upon a seedling of Japanese barberry (Berberis thunburgii). Should I start checking myself for deer ticks? Are all the plants in the bed soon to expire?
Japanese barberry is a commonly planted ornamental that was introduced into this country almost 150 years ago. For decades upon decades, it sedately graced landscapes with its boxwoodlike (but not evergreen) leaves, yellow flowers and bright red berries, all set off against a backdrop of dark-brown thorny stems.
For some reason, the plant began to spread about 35 years ago. Perhaps it was the increased planting of barberries around homes, along highways and outside shopping malls. Those plants spawned yet more plants as birds ate the berries and spread the seeds. Perhaps it was the surge in deer populations: a response to the creep of suburbia, as well as to the decreased number of humans willing to take to the woods, rifle in hand, to fell a deer. All the while that deer were munching away on our roses, rhododendrons, yews and other landscape plants, they rarely browsed barberry.
Okay, so more deer mean more Lyme disease. Deer blood is what nourishes adult ticks, and as they feed, they reproduce and hitchhike across the landscape on their deer hosts. But the Lyme bacteria actually get into the ticks only after feeding on the blood of small rodents, such as white-footed mice, that are harboring the bacteria. Recent research in Connecticut has shown that barberry also creates a very nice sheltered habitat for mice.
To make matters worse, barberry also makes things homey for the deer ticks themselves, mostly by providing humidity. A forest with barberry growing in it hosted 120 Lyme-carrying ticks per acre; without barberry, a mere ten per acre.
So much for the threat of Lyme disease in my heath bed. What about the demise of the plants there?
Turns out that barberry is also prime habitat for earthworms, which, at first blush, would seem like a good thing. After all, earthworms are a gardener’s friend, right? Maybe. North of where the last glacier descended, the southern extent of which cut into much of northern US, all native earthworms were wiped out. The natives have been very slow to recolonize, but earthworms from Europe and Asia that arrived here in ship hulls and soil, and as fishing bait, have not been shy. They’ve spread rapidly.
Non-native earthworms thrive especially well in the soil beneath barberry bushes. It could be that barberry leaves are more digestible to them; it could be that barberry alters the soil chemistry to their liking.
These exotic earthworms are good at gobbling up raw organic matter, as in the leaf litter that blankets our forests – and my heath bed, to which I import leaves. The newcomers can actually gobble up forest litter faster than it is replenished, changing the soil habitat and exposing the soil to erosion. Plants in the heath bed – i.e., plants in the heath family – like that leaf litter; it keeps the soil cool and moist and, as it slowly decomposes, enriches the soil beneath with decomposed organic matter, or humus. There is some evidence that the makeup of our native forests – which include rhododendrons, also in the heath family – is changing due to the work of exotic earthworms.
And all this from barberry!
I’m not all that worried about ticks or the demise of my heath bed. The bed is small enough and watched closely enough so that all barberries can be ripped out – just like the one that I saw yesterday. My cat keeps mice at bay, and my dogs do likewise for deer. And I import more leaves each year than earthworms, even exotic ones, could gobble up.
The extensiveness of wild settings makes barberry control there difficult. Options there are cutting, pulling, fire and/or herbicides.
No need for such drama in a home landscape. Here, barberry is easily controlled, if desired, by nothing more than being pulled out or repeatedly cut to the ground. One or a few bushes are not going to impact mouse populations or Lyme hazard significantly. Their greatest impact would be to make berries that, with the help of birds, would further the spread of this bush. Newer, sterile varieties offer ornamental mounds of greenery that don’t contribute to the plant’s spread.
My heath bed, incidentally, has no heath plants. Heaths (Erica spp.) would die in our cold winters. I call my bed a “heath bed” because I grow heath family (Ericaceae) plants in it: rhododendrons, mountain laurels, lingonberries, huckleberries, swamp azalea and some heather (Calluna spp.). I group these plants together because all demand special soil conditions – conditions quite different from those of most cultivated plants.
Most heath plants need a soil that is very, very acidic, relatively infertile, well-aerated, consistently moist and rich in organic matter. As mentioned above, these plants thrive where the ground also has a mulch of leaf litter, wood chips or other organic matter: a mulch that disappears too quickly where soils harbor large populations of the non-native earthworms that thrive beneath barberry bushes.
Join me for a Drip Irrigation Workshop on Saturday, June 20 from 2 to 5:30 p.m. Learn how drip saves 60 percent in watering, why drip keeps plants healthier and how it saves you time by reducing weeding and being easily automated. This workshop will include a hands-on design and installation of a drip system. The cost is $57. Registration is necessary. For more information and registration, go to https://www.leereich.com/workshops.
Any gardening questions? E-mail Lee at [email protected] and he’ll try answering them directly or in his Almanac Weekly column. To read Lee’s previous “Gardener’s Notebook” columns, visit our website at HudsonValleyAlmanacWeekly.com.