Fall flower bed cleanup in Central Texas

A fall flower bed cleanup in Central Texas is two jobs, not one. In October and November, pull what is spent, weed, cut back the fall bloomers once they finish and top up the mulch. Leave the rest of the perennials and ornamental grasses standing until February. Cutting every bed to the ground in October is the mistake to avoid, because it strips plants of the cover they need for the coldest weeks.

When should you cut back perennials in Central Texas?

Cut back most perennials and ornamental grasses in February, not in the fall. Texas A&M AgriLife Extension's Travis County office puts it on the February checklist: cut back all perennial flowers and ornamental grasses, perennials to 2 to 4 inches above the ground and grasses to 6 to 10 inches.

The exception is the plants that bloom in fall. The same office's November checklist says to cut back fall bloomers like asters and chrysanthemums all the way to the ground once they are done. Everything else can wait.

The calendar explains why February works. The National Weather Service's Austin climate summary puts the average first freeze at December 1 and the average last freeze at February 15, using the 1991 to 2020 normals for Camp Mabry. The earliest first freeze on record there came on October 26, so a bed cut back in mid-October can still meet a hard frost with nothing on top of it.

Why leave the dead stems standing through winter?

Dead stems protect the living crown underneath them. Michael Arnold, director of The Gardens at Texas A&M, told AgriLife Today that pruning too early removes dead plant material that insulates living tissue from later freezes, and can push new growth before the frost threat has passed. His summary was that dead material is nature's insulation, and cutting plants back too soon can harm more than help.

AgriLife defines a hard freeze as 28 degrees or below for four hours or more. That is the kind of night where a perennial cut flush in October has the least protection, and where new shoots coaxed out by a warm week in December get burned back.

The stems also house bees. The Xerces Society notes that small carpenter bees and yellow-faced bees nest in hollow or pithy plant stems and spend the winter there. Its stem-nesting guide says to leave dead flower stalks intact over winter, then in spring cut them back to stubble of varying height, 8 to 24 inches, so the next generation has places to nest. In a native or pollinator bed, that taller cut is a reasonable trade for a slightly rougher look in March.

What should come out of the beds in the fall?

Remove anything that is finished or carrying a problem, and leave the rest. AgriLife's Travis County checklists give a short list:

• Spent annuals: pull summer annuals once they quit, and remove annuals killed or burned by frost. Check the roots as they come out; knots on the roots point to nematodes.
• Diseased foliage: if roses show fungal leaf spot, strip the affected leaves and rake up the fallen ones for disposal. AgriLife's Don't Bag It plan says to keep diseased or insect infested plant material and noxious weeds out of the compost pile.
• Weeds: get them while they are young, before they put down roots. A bed weeded in fall is far easier to keep clean through winter.
• Caladiums: dig and store the bulbs when the foliage dies back.
• Shrubs: trim off long, gangly shoots and remove dead or damaged wood, which also cuts down on debris in a windstorm. Save any real shaping for late winter through trimming maintenance, and leave spring bloomers alone until after they flower.

When	What to do in the beds
October	Pull spent annuals, weed, dig caladiums, plant new perennials and shrubs
November	Cut fall bloomers to the ground, check and replenish mulch
December and January	Clear frost-killed annuals, keep up with young weeds, leave perennial stems standing
February	Cut back perennials and ornamental grasses

How much mulch should go back on a flower bed?

Two to three inches in a flower bed. AgriLife's Don't Bag It plan calls a 2 to 3 inch layer of shredded leaves ideal in annual and perennial beds, and 3 to 6 inches around the base of trees and shrubs. The Earth-Kind program recommends maintaining a three-inch layer of plant-derived mulch such as native hardwood, and notes it significantly cuts the water a landscape needs.

The fall leaf drop is a free source. The October checklist suggests running fallen leaves over with the mower and using the shredded material as mulch for perennials, and the November checklist says to check mulch and replenish it where it has thinned. Don't Bag It lists what that layer does over winter: it holds moisture, holds back weeds, moderates soil temperature and keeps bare clay from crusting.

Fall is also planting season here. AgriLife's October checklist calls it the best time to plant new trees and shrubs, and says to get new perennials and grasses in before frost arrives. A bed that has just been cleaned out and mulched is the easiest place to do it.

When is it worth handing the beds off?

When the beds are big enough that the two-pass schedule keeps slipping. The fall pass and the February cutback are both short jobs on a small bed and a full day on a large property, and the February one lands right when the lawn starts asking for attention too. That timing is what our landscape maintenance visits are built around: beds weeded and cleaned in fall, mulch topped up, and perennials and grasses cut back on schedule in late winter.

If your property is in Georgetown or nearby, the one change worth making this year is simple. Pull what is spent now, mulch, and let the rest of the bed stand until February. Our crews can put both visits on the calendar so neither one gets missed.

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