Lawn care tips for northern Indiana

Crabgrass is an annual weed that dies every winter and comes back from seed every spring, which means the whole game is the pre-emergent. Purdue's guidance is unambiguous: the herbicide has to be on the ground and watered in before soil temperature holds in the mid 50s at the top couple of inches, because that is when the seed starts to germinate. Miss that window and you spend the summer fighting a weed that is already growing.

Timing it by the calendar is a mistake. Purdue publishes a growing degree day model, about 200 growing degree days on a 50 degree base, and notes that the old forsythia-bloom rule runs a little ahead of germination but is not reliable on its own. In a warm March we are putting product down in late March. In a cold spring we are two weeks later. Our fertilization and weed control programs all include the pre-emergent as a standard part of the spring visits.

The pattern is unmistakable. A patch goes from green to gray-brown in a week, and when you pull on it, it lifts like a rug because the roots are gone. That is annual white grubs, the larvae of Japanese beetles and masked chafers, feeding an inch below the surface.

Purdue's timing here is precise. Annual white grub eggs have hatched by the end of July, so preventive treatment belongs in early to mid July, before the grubs are actively feeding. Curative work lands in August and into September while the grubs are still small and near the surface. Two more things are worth knowing: Japanese beetles prefer to lay eggs in irrigated turf, and grubs are scarce in lawns that stay very dry through July and early August. The irrigated part of the yard is the part most at risk. Our grub control page covers both sides, and how to spot grub damage early walks through catching it before the sod lifts.

Anywhere the builder graded, drove and rolled sod onto stripped subsoil, you have a compaction problem the sod cannot fix on its own. Roots stall at two inches because they physically cannot push through, water runs off instead of soaking in, and the lawn thins by the third summer even under careful care.

Core aeration is the actual fix. Pulling plugs opens the soil, gives roots somewhere to go, and lets air, water and nutrients reach depth. On a compacted new build we usually pair fall aeration with overseeding into the holes, then repeat annually for two or three years. Our core aeration page explains the process, and when to core aerate in northern Indiana covers the timing in detail.

In a stretch of warm nights and humid afternoons, brown patch and dollar spot can turn a good lawn ugly in a few days. Brown patch shows up as roughly circular tan patches, often with a darker ring on the leading edge. Dollar spot shows up as smaller bleached spots the size of a coin that can run together. Neither is grubs, and neither is drought.

Prevention is cultural: water deeply and early so the leaf dries by afternoon, do not overfeed nitrogen in July, and keep mowing tall so air moves through the canopy. The curative side is a targeted fungicide, timed to the disease and the weather. Our disease and fungicide programs cover diagnosis and treatment both.

Shade lawns fail for three overlapping reasons: not enough light, competition from tree roots for water and nutrients, and the wrong grass species for the conditions. Bluegrass and ryegrass struggle under a canopy. Fine fescues and shade-tolerant tall fescue mixes do much better, and they still want at least four hours of filtered light.

The realistic playbook is to overseed in fall with a shade-tolerant mix, raise the mower another half inch in shaded areas so the plant has more leaf to catch what light there is, thin the canopy where you can, and accept that a deep shade corner may never look like the sunny front yard. Our overseeding page covers our fall seeding process.

Push a long screwdriver into the lawn. In healthy soil with reasonable moisture it slides in six inches with almost no effort. If it stops at two inches you have compaction, and no amount of fertilizer fixes that until you aerate. If it slides in easily but the soil around it is dust dry, you have a watering problem, not a nutrition problem.

In a bad spot, cut a small square with a spade and lift it. Healthy roots are white and dense and run two or three inches down or more. Roots that stop at an inch mean shallow watering or compacted soil. If the underside has fat white C-shaped larvae in it, you are looking straight at the cause.

Every three or four years is enough. A basic test tells you pH, organic matter and your major nutrients. On glacial ground the values change within a mile. Warsaw sits on sandy outwash, loamy sands that drain fast and hold very little water, with pockets of muck that do the opposite and stay wet. Pierceton lawns are mostly well-drained fine sandy loam on moraine till, with a somewhat poorly drained loam common inside town. Toward Columbia City and southwest Allen County it turns to heavy clay. A sandy front yard and a soggy back corner on the same lot is real, not something you are imagining.