Yes, for evergreens that face drying winter wind, strong winter sun, or their first winter after planting. A late fall application of Wilt Pruf, mixed at the stronger winter rate, coats foliage in a clear film that slows water loss for three to four months, covering most of the season.

Why do evergreens lose water in winter?

Because they keep their leaves and needles, which continue releasing moisture all winter. When the ground is frozen, roots cannot replace that water, and the foliage dries and browns, a condition called winter burn. Broadleaf evergreens such as holly, boxwood, and laurel, with large leaf surfaces, are especially prone.

Which evergreens benefit most?

Those planted within the past year, those on open, windy sites or facing south or west, and broadleaf evergreens near walls or pavement that reflect sun. Evergreens sheltered from wind and well watered through fall may need no treatment, though the winter tree care guide describes an application as very beneficial against winter damage.

When and how is Wilt Pruf applied before winter?

In late fall, after a final deep watering and before hard freezes set in, on a dry day when the film can dry. Mixing Wilt Pruf Plant Protector Concentrate at 1 part to 5 parts water gives the winter rate, and the spray covers foliage and stems evenly. To treat a few shrubs without mixing, Wilt Pruf Plant Protector Ready to Use Spray sprays straight from the bottle.

Frequently Asked Questions

Can Wilt Pruf be reapplied during winter?

Usually only if the film has worn off before spring, on a mild, dry day above freezing.

Does Wilt Pruf replace fall watering?

No. It slows water loss from foliage, but the roots still need a deep watering before the ground freezes.

Is browning in spring always a winter burn?

Not always. Drought, root damage, insects, and disease can look similar, so the whole tree is checked before a cause is assumed.

Should pines be treated too?

Yes, when exposed or newly planted, since its product pages list evergreens in general, though the product label is worth checking for any specific cautions.