basil under pressure: the fight against devastating downy mildew

Most lawn maintenance chores coincide with the mowing season. If you live in Florida, lawn care can be a year-round task. Luckily, most other Southeast gardeners are able to take a break during the winter. Yet, no matter how many months of the year you tend the yard, proper lawn care is essential to grow lush, green turf in Southeastern US states.

Check out How to Grow Perfect Bunch of Peace Lilies with These Tips and ensure you have a blooming and thriving plant always!

Florida pusley is a low-branching, annual summer weed. Its pretty, white, star-shaped flowers produce an abundance of seeds, and a single plant can quickly turn into an infestation. This weed is extremely drought tolerant and can easily out compete lawns that are not irrigated during extended dry weather conditions.

It never fails that come March and April, the desire for many of our lawns to begin to breaking dormancy is met with the horror that the only things that seem to be green are the weeds that we have been ignoring throughout winter. This may include white clover, dandelions, chickweed, the painful lawn burweed, or so any other species. These weeds may be welcome to some homeowners as some serve as early pollen sources for pollinators, but they can also be a nuisance to others.

Homeowners have had to combat root-knot nematodes for as long as home vegetable gardens have existed. Nematodes are microscopic worms in the soil in high numbers that can cause damage to susceptible plants. Traditionally, the vegetables most affected were beans, watermelons, cucumbers, and especially three grower favorites: tomatoes, sweetpotatoes, and okra. Although there are many types of nematodes in the soil, root-knot nematodes are some of the most common and cause the large galls or knots you see on the roots of susceptible plants

The spotted lanternfly (Lycorma delicatula) (SLF) is the latest non-native species to take hold in the U.S. This planthopper is large (about a half-inch long) and originally from several countries in the Far East. It was first found in Pennsylvania in 2014, and active infestations are now established in Connecticut, Delaware, Indiana, Maryland, Massachusetts, New Jersey, New York, Ohio, West Virginia, Virginia, and as of just last week, North Carolina. SLF has not been detected in South Carolina, but it is an insect for which we need to be on the lookout.

I’ll be roaming the Northeast in the early going, in places as close to home as the Berkshires of Massachusetts and the Hudson Valley of New York, but also across Massachusetts and as far as New Hampshire, Maine, New Jersey and coastal Connecticut. Events here in the garden will begin again in April; stay tuned for a fuller schedule of those, with just the first couple mentioned below.What’s planned already:Saturday, February 19, 2 PM: Lecture to benefit Berkshire Botanical Garden, Monument Mountain Regional High School, Great Barrington, MA.Thursday, March 3, 7 PM: R.J. Ju

(Note on Gallery: Clicking on a thumbnail gives you a large, higher-quality image.)Winterberry hollies are native to swampy areas from Canada south to Florida, from Wisconsin and Missouri east.  Despite their heritage in wetlands, I grow my plants in normal to dry soil, at the edges of my hilly outer fields. I just don’t have wet lowland to offer on my windy hillside.Though they’ll fruit much better in a moist year than a dry one (as with all fruiting plant

First, a recap of what Impatiens downy mildew (the fungus-like Plasmopara obducens) looks like:Did your impatiens seem to collapse in 2012? Early signs of infection may have been leaves that looked yellowish, as if the plant needed feeding, or foliage that curled under or seemed to wilt. Sometimes, a white material (the downy mildew) is visible on the undersides of leaves. Eventually, plants may defoliate, drop their flowers, and basically collapse. The fungus loves moist conditions and cool nights in particular. Particularly disturbing: symptoms happened earlier last year than before—as early as June.The disease, which attacks Impatiens walleriana (the species our

The ‘Rogers’ strain is technically Aesculus parviflora var. serotina ‘Rogers’ (I know, a mouthful), a selection of a Southern U.S. native variety labeled serotina. Though much younger than my plain old Aesculus parviflora, my ‘Rogers’ is already much larger—more than 20 feet across and probably headed for 15 or so high. It was too hot and sunny for a good photo while it was in is prime, but you get the idea from the one below. A beast! So big, in fact that I planted it way too close to something it is now engulfing (left side of above photo). Funny to think about this Alabama, Georgia and northern Florida native being perfectly at home and so robust way up North in my garden, but it is.Either Aesculus makes a bold statement and is perfectly happy in

Gardeners in some areas of Texas where the species is endemic are smiling right now. “I’ve got them all over my backyard,” they are perhaps saying, because the species can be found growing as a self-sowing annual in parts of Florida and North Carolina and Texas, says the Lady Bird Johnson Wildflower Center.The H. argophyllus selection I grew in 2012 was a refinement of the straight species called ‘Japanese Silver-Leaf’ (which I expect was so named after being bred in that country, as numerous fine sunflower varieties have been—crossing the genetics of our various U.S. natives). My plants grew from about 5 feet to 7 feet.Various sources say one should hide its awkward-looking “legs” with some other mid

AllImpatiens walleriana types are potentially affected. That’s the species that the common garden impatiens is bred from, as are the double-flowered types and miniatures and the Fusion series I like so much (that’s variegated Fusion Peach Frost, above). Other impatiens species may likewise be susceptible–even the native jewelweed, Impatiens capensis.The updated Impatiens Downy Mildew factsheet from Cornell Cooperative Extension explains that early signs of infection may have been leaves that looked yellowish, as if the plant needed feeding, or foliage that curled under or seemed to wilt. Sometimes, you can see a white material (the fungus) on the undersides of leaves. Eventually, plants may defoliate, drop their flowers, and basically collapse. The American Floral Endowment website has detailed photos of symptomatic plants, and other links (most geared to growers) about this threat to a favorite bedding plant.Categoriesannuals & perennials compo