SAWS News: Last Chance to Prune Oaks
Aquifer Beaker

Edwards Aquifer

Aquifer Level 682.6'
3/25/19 - Official

The Edwards aquifer and its catchment area in the San Antonio region is about 8,000 square miles and includes all or part of 13 counties in south-central Texas.

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Year-Round Watering Hours

Watering with an irrigation system or sprinkler is allowed any day of the week before 11 a.m. or after 7 p.m.

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Aquifer Level 682.6 | Year-Round Watering Hours

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Last Chance to Prune Oaks

If you plan to prune your oak trees this winter, there’s not much time left if you want to minimize the chance of oak wilt. During the coldest days of the year, the beetles that carry the spores of the oak wilt fungus are very few and unlikely to fly. Pruning is done for three reasons (in order of importance): safety, tree health and appearance. Although appearance is often mentioned as a reason for pruning, it’s really the least significant. (After all, trees don’t get pruned in the forest.) Some helpful dos and don’ts:


  • Prune narrow branch junctions that are V-shaped; these are structurally weak, especially if two or more of the branches are of equal diameters.
  • Long branches that have been repeatedly stripped of their lateral branches should be shortened or removed completely.
  • Look for the “3-D” branches — dead, diseased and dying. These are a source of disease and insects.
  • Never cut through the branch collar. This donut-shaped ring at the junction of two branches or trunks has specialized cells that reduce decay and disease.

Finally, always paint fresh oak wounds — this is essential to preventing oak wilt.


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