4/21/17: In the garden this week


Violets are not weeds! They’re an extremely important larval food source for a large group of butterflies. No violets, no fritillaries. And they’re lovely as well.

After a bizarre start, with the late snowstorm in mid-March, spring is unfolding in a normal and reassuring way (although for those of us who remember when lilacs bloomed reliably for Mother’s Day, everything is still insanely early). Violets are blooming, most native trees are beginning to leaf out, early bloomers like spicebush and native plums have finished blooming, flowering dogwood (which used to bloom around Memorial Day) is almost at its peak. None of my native shrubs were affected by the late frost, although many exotics, such as the early-flowering Asian magnolias, bloomed sparsely if at all.

In the understory, bloodroot is in bloom right now, as are Virginia bluebells. Columbine is showing buds, Solomon’s seal is raising its delicate head above the leaf litter, and native geraniums are showing buds. Most summer-blooming perennials are up, with the exception of milkweeds and wild petunia, which always come late to the party. They must feel the need to make an entrance.

There’s a lot to do in the garden this week and throughout the spring:

water new plantings: Although the past two weeks have been dry, we received an inch of water last night, so no need to water this week. But check back here weekly for updates: In any week in which we receive less than an inch of rain, water all plants installed this spring or last fall. How do you know when we’ve received an inch of rain? You can make a highly sophisticated rain gauge–an old plastic container or tin can placed among the plants. I total the weekly rainfall and decide whether to water my new trees or my clients’ new plantings each week.

plant trees and other woody plants. Don’t wait too long—plants grow roots when the soil is cool, so the earlier you plant, the more time trees and shrubs will have to establish before the weather really heats up.

provide prophylactic care for trees. Several native tree species are at great risk of succumbing to invasive insect infestations. Hemlocks should be sprayed with dormant oil (which is not a pesticide) in early spring and early fall. Ash trees are subject to emerald ash borer. Consult a qualified arborist if you’re not sure if you have hemlocks or ashes; he or she can them recommend the best treatment options.

— continue to start vegetable seeds indoors. You’ll find a schedule here. Get the vegetable garden ready for the coming season by weeding, raking the soil smooth, and adding compost or well-rotted manure. Compost can simply be spread on top of the soil; manure should be mixed in, and make sure it’s not fresh manure. Once the soil is prepared, you can plant seeds of cool-weather crops such as mesclun, spinach, arugula, peas, and beets in the garden. Do not set out warm weather crops like tomatoes and squash for another few weeks.

Clean up the perennial garden. It’s finally time! Compost as much as the detritus as you can, and treat it gently: it contains the pupae and larvae of valuable insects, bees, and butterflies. And leave a little on the ground for birds to use as nesting material. As I glance out the window, a robin is collecting bits of grass and stalks I left behind.

—Divide perennials as they emerge. The earlier you divide or move perennials and grasses, the quicker they will establish. Even finicky, hard-to-divide plants will respond well. And it’s much easier to divide and replant a few plants at a time than to dig up an entire bed.

it’s much too early to feed your lawn, no matter what your lawn-care service tells you. Wait until Memorial Day, and then use a slow-release organic fertilizer. Or best of all, don’t feed at all this year. The lawn will look just fine. And remember, pesticides kill butterfly and firefly larvae and native ground-dwelling bees as well as “bad” insects. And garden chemicals are not so great for kids or pets either; common herbicides are carcinogens. Best to avoid them.

— Support a local farmer by joining a CSA (community supported agriculture) this season. CSAs allow you to support small-scale, sustainable agriculture and help limit the environmental effects of factory farming. You’ll also find that the produce tastes much, much better than what you buy in the supermarket. For the past 5 years or more, we have joined Hesperides Organica, a family-run farm located in Hawthorne, NY. They deliver weekly to various locations in Bergen County.

Enjoy the garden this week–the weather and the soil moisture will be perfect!


The delicate flowers of native plum, Prunus americana, are intensely fragrant and as lovely as any exotic cherry can produce.



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