Early spring, once the soil warms, is the main time to fertilize a boxwood, with an optional second feeding in the middle to end of fall. Timing matters because a boxwood keeps its leaves all winter, and soft growth pushed late in the season goes into the cold unprepared.

Why does timing matter for a boxwood?

Boxwood is a broadleaf evergreen prone to winter burn, which happens when leaves lose moisture on sunny or windy days faster than roots in frozen ground can replace it. Quick release nitrogen weakens new growth and leaves it more exposed to wind and cold, and a feeding high in nitrogen in the middle or end of summer pushes tender growth that can't harden before winter.

What should the spring feeding be?

A slow release formula matched to boxwood. Applying TreeHelp Premium Fertilizer: Boxwood below the grass roots near the drip line, the circle beneath the outer edge of the shrub, early each spring once the soil warms gives the roots slow release nitrogen that keeps feeding through the growing season from that single application.

What should a fall feeding be?

A formula built for dormancy, rich in potassium for root development. To build roots before winter without triggering new top growth, TreeHelp Fall Fertilizer is worked into the soil around the root zone in the middle to end of fall, as trees and shrubs enter dormancy.

Frequently Asked Questions

Does a boxwood need winter protection as well as feeding?

Often, yes. Unlike fertilizer, which works through the roots, Wilt Pruf Plant Protector is sprayed onto the leaves in fall, before winter sets in, leaving a clear coating that slows moisture loss for three or four months.

Is it too late to feed a boxwood once fall is well underway?

Not until the soil gets too cold. Roots stay active well into fall and can still take up nutrients until then.

Should a boxwood with winter burn get extra fertilizer?

Not right away. Recovery depends on whether live buds and stems remain, so feeding waits until new spring growth begins, and then a formula low in nitrogen suits a stressed shrub.

Should a boxwood be watered before winter?

Yes. In colder regions, watering continues until the ground freezes, which gives the roots moisture to draw on through winter.