As we reach the season of scorching temperatures in the Sonoran Desert, our trees need a little extra TLC to keep them healthy and thriving. Follow these simple steps to keep your trees happy this summer!
1. Expand the watering basin if necessary
- If your tree has grown, expand the watering basin to encourage lateral root development
- To make the basin, form a berm of soil a few inches high just beyond the drip line of the tree
- Gently tamp down the berm to compact the soil enough to retain water
2. Add a fresh layer of organic mulch
- Lay 1–2 inches of organic mulch (wood chips, shredded bark, or compost) in the basin
- Keep mulch a few inches away from the trunk to prevent disease, pests, and rot
- Benefits: Mulch insulates roots against heat, helps to retain soil moisture, and provides essential nutrients for your tree as it decomposes
3. Increase watering
- For newly planted trees (≤ 2 years old): water 2–3× per week
- For established trees: water once every 2–3 weeks, especially until monsoon rains arrive
- Tip: run your hose on a slow trickle just inside the dripline (in the basin) for 30–90 minutes to allow deep percolation into the soil
4. Skip the Summer Pruning
- Avoid pruning unless absolutely necessary (e.g., a broken or hazardous branch)
- Summer cuts stress trees further during heat; save pruning for late winter or early spring
5. Look for signs of stress
- Check weekly for dry, wilting, or scorched leaves. If you see any of these signs, your tree needs more water!
- Check young trees for signs of sunscald. If the bark looks damaged, consider a simple wrap or organic sunscreen to protect the trunk until the tree develops a larger shade canopy
- Look for signs of pests or disease. This usually means the tree needs more water
By following these tips, you’ll help your trees thrive all summer long! If you have any questions regarding tree care, contact us at treesfortucson.org or [email protected]. We’re here to help!