Mayhaw

Year-round

Western mayhaw (Crataegus opaca) is a thorny, small flowering tree from Gulf Coast wetlands. In Memphis it is grown outside its documented native range, so treat it as an introduced planting that wants steady moisture and part shade, in return for white spring flowers and tart red fruit good for jelly.

• Give it consistently wet, rich soil. In the wild it grows in swamps and creek and river bottoms, so it will struggle in a dry, fast-draining bed.
• Aim for a soil pH around 6.0 to 6.5 and a part shade to full sun spot.
• This species is documented as native to Gulf Coast states such as Texas, Louisiana, Mississippi, and Alabama, not Tennessee. Grow it in Memphis as a Gulf Coast species outside its documented range rather than calling it a native planting.
• At the genus level, hawthorn (Crataegus) is listed as non-toxic to dogs, cats, and horses. A nibbled leaf or dropped fruit is not a poisoning worry, though a lot of fruit at once can still cause an upset stomach.
• If you plant more than one, space them 20 to 30 feet apart since mature trees spread wide.

Fall

Fall is cleanup and prep time in Memphis: clearing dropped fruit, pruning to an open shape, and finishing up before the average early-November frost.

• Prune to an open, vase-like shape, similar to how you'd prune a peach tree, during late fall or winter dormancy. This makes the thorny branches easier to manage and next year's fruit easier to reach.
• Rake up and remove dropped, rotting mayhaw fruit from the yard, especially near a front walk or driveway, as part of a normal fall cleanup.
• Memphis's average first fall frost lands around November 3. Finish any major pruning or new planting before then so the tree isn't stressed heading into winter.

Raking up dropped fruit and pruning to a tidy, open shape in fall reads as intentional, deliberate yard care and helps avoid an HOA violation letter about mess near the front walk.

Winter

Winter is dormant season for mayhaw in Memphis. This is the best window for structural pruning, and it's worth keeping an eye on cold protection since the tree is being grown outside its warmer, wetter native Gulf Coast range.

• This species is documented as native to Gulf Coast wetlands in states like Texas, Louisiana, Mississippi, and Alabama, not Tennessee. A Memphis planting sits at the cooler edge of what it's used to, so watch young trees for winter dieback after a hard freeze.
• Winter dormancy, after leaf drop and before the average March 30 last frost, is the best window for structural pruning to an open center shape.
• Keep a mulch ring around the base to help hold moisture. Wild mayhaw grows in wetland soil that stays damp even in the cooler months.
• A bare, thorny mayhaw can look untidy at the curb in winter. A fresh mulch ring and one clean pruning pass keeps it reading as a maintained tree rather than a neglected one.

A fresh mulch ring and one clean winter pruning pass keeps a bare, thorny mayhaw reading as intentional rather than neglected, which helps avoid an HOA letter.

Spring

In Memphis, mayhaw blooms very early, often while frost is still a real risk, so spring care is mostly about protecting the flowers and watching for a fruit disease right at bud break.

• Expect white flowers as early as February into March, well before Memphis's average last spring frost of March 30. A late cold snap can damage the blooms and cut the fruit set.
• Watch for quince rust, which infects mayhaw from when flower buds first show color through the end of bloom. A sulfur or myclobutanil fungicide applied in that window is the standard home treatment, since nearby cedar and juniper trees help the fungus complete its life cycle.
• Keep the soil consistently moist through bloom and leaf-out. This species does not handle a dry spring well.
• If you have more than one tree, spring bloom is also when cross-pollination happens, so avoid removing a nearby mayhaw right before flowering.

Summer

Summer in Memphis is hot and can turn dry, so the main job is keeping the root zone steadily moist while the fruit ripens, plus a yearly feeding and a watch for fire blight.

• Fruit ripens from May into June, which is where the tree gets the name mayhaw. Early summer is harvest time if you want the tart fruit for jelly.
• Keep watering through hot, dry stretches. Wild mayhaw grows in wetland soil that rarely fully dries out, so a Memphis summer dry spell will stress a tree used to that much moisture.
• Established trees benefit from about one pound of a balanced fertilizer like 5-10-10 per inch of trunk diameter, applied once a year. A soil test can tell you if it needs more or less.
• Watch for fire blight, a bacterial disease that hits hawthorn and other Rosaceae-family trees in Tennessee. Prune out and dispose of any blackened, burnt-looking branch tips as soon as you see them, and sanitize your pruning tool between cuts.