Spring is in full swing, and with summer just around the corner, trees are putting out new growth, and our landscapes are coming to life. One of the most common questions we get this time of year is: “What should I do under my live oak tree? Grass just won’t grow.”
That’s a great question — and a common challenge. Live oaks have dense canopies that create heavy shade. Combine that with moisture competition and root spread, and it's no surprise grass struggles to survive underneath. Most turf grasses thrive in full sun, so trying to grow them under a live oak often leads to frustration and frequent maintenance issues.
Besides being weak in shaded conditions, grass under a tree often gets damaged during mowing. Frequent mowing in these areas can also harm the tree by compacting soil and injuring surface roots.
Instead of battling with grass, we recommend expanding the mulch area beneath the tree — ideally up to the tree’s drip line (the outer edge of the canopy). If that’s not feasible, even mulching half the drip line can make a big difference.
But what if you don’t want to look at a bare mulch bed? You can plant the right type of low-maintenance, shade-tolerant ground cover that benefits the tree — not competes with it.
Giant liriope is a great choice. It’s a "giver" plant — one that actually helps improve the health of the soil and the tree. Liriope captures airborne nitrogen and releases it into the soil through its roots, enriching the environment beneath your oak. It also helps retain moisture, holds mulch in place, and reduces soil compaction since you won't need to mow in that area.
Liriope also adds beauty, filling in densely and producing purple flower spikes that bring color to shaded spots.
1. Avoid piling mulch against the trunk — keep it pulled back a few inches.
2. Space liriope about 1–2 feet apart for good coverage.
3. Let leaves and natural debris fall — they’ll break down and add organic matter over time.
By planting beneficial ground covers like giant liriope and reducing mowing around the tree, you’ll protect your live oak and create a beautiful, low-maintenance landscape.
Questions? We’re here to help!
