Yes, grass in acidic soil can grow, but only up to a point. Grass handles mildly acidic ground just fine, yet most lawns want near-neutral conditions to look their best. Once the soil turns strongly acidic, the turf thins out and weeds and moss start to take over the bare spots.
A patchy lawn that struggles in the shade is often the first clue. When moss creeps in under trees and the grass keeps thinning each year, the ground has likely turned too acidic for it. The grass is not dying from lack of water. It is starving in soil that has drifted out of its comfort zone.
Most lawn grasses grow best at a lawn soil pH between 6.0 and 7.0. UNH Extension points to this range as the window where the most nutrients stay available to the roots. Drop below it and the chemistry shifts. Key nutrients like nitrogen and phosphorus lock up in the soil, so the grass cannot reach them even when you feed it.
That is the real problem with strongly acidic ground. The food is there, but the roots cannot use it. You can pour on fertilizer all season and still get a pale, thin lawn because the low pH blocks the uptake. Fixing the acidity does more for the grass than another bag of feed ever will. So before you spend on more feed, check the pH and make sure the soil can even hand those nutrients over to the roots.
Some grasses cope with mild acidity better than others. Fine fescues and tall fescue tolerate slightly sour soil and shade, which makes them a smart pick for problem spots. Kentucky bluegrass is far fussier and turns thin and weak as the pH falls. So if your yard sits under big trees and reads on the acidic side, try over-seeding the thin areas with a fescue blend. Picking a grass that suits your ground saves you a lot of fighting later, and you should match the seed to your soil instead of forcing one type to cope.
Moss is the other tell. It does not kill your grass, but it moves into the gaps that acidity and shade open up. Where the turf grows weak and thin, moss spreads across the bare soil and takes the space. Treating the moss alone never works for long. You have to fix what let it in, which usually means more light and a better pH.
Start by testing your lawn before you change anything. A simple soil test kit shows your exact number, and you stop guessing. Pull a few small plugs from different parts of the yard, mix them, and check that blend so one odd spot does not skew the result. If the reading comes back strongly acidic, below 5.5, that is your sign the grass needs help. A test costs a few dollars and tells you whether the soil is the real cause or just a symptom of something else.
When the number reads low, raise it by liming a lawn with standard garden lime. Spread it at the rate your soil test recommends, since the right amount depends on how acidic your ground is and how heavy the soil sits. Lime works slow and gentle, so the pH climbs over months, not days. Water it in, wait, and test again the next season to see where you stand.
Grass and acidic soil can get along once you bring the pH back toward neutral. Test first, pick a fescue for the tough shady spots, and lime at the rate your results call for. Do that, and the thin, mossy patches fill back in with healthy green turf.
Read the full article: Acidic Soil Plants: A Complete Guide
