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Winter Watering in Colorado: When and How to Water Trees and Shrubs

· By Puskas Landscape & Design

The short answer

From November through March, water trees, shrubs and perennials once or twice a month whenever there has been little snow. Pick a sunny day above 40°F, water around midday so it soaks in before the night freeze, and put new plantings and evergreens first.

Why dormant plants still need water

Roots stay alive all winter, and our winters bring long dry stretches with sun and wind. Evergreens keep losing moisture through their needles the whole time. Plants that go into spring dried out leaf out late, drop branches or die back.

How to do it

  • Wait for a day above 40°F with no snow on the ground.
  • Water at midday so the moisture soaks in before temperatures drop.
  • Water at the drip line of trees, under the outer branches, with a slow trickle.
  • Use a hose, since the sprinkler system should already be blown out. Disconnect the hose when you finish.

What to water first

If you only have time for part of the yard, start with anything planted in the last year or two, then evergreens, then plants on the south and west sides of the house where sun and wind dry the soil fastest. A good rule: if there has been no snow for three to four weeks, your plants are probably thirsty.

Common questions

Does snow count as watering?

A good wet snow does. Light, dry snow that blows away or sublimates adds very little moisture, so check the soil instead of counting storms.

Should I water my lawn in winter?

New sod and lawns on south-facing slopes benefit from it during long dry spells. Established lawns in shade usually do not need it.

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