Owens Valley has had a dry winter so far. December brought no rain, and by mid-January, we've seen about 5 inches of evapotranspiration (ETo) since November but less than an inch of rain. This means soil moisture has dropped, and depending on the plant type and dormancy, the root zone might be missing anywhere from ½ to 4 inches of water. So, is it time to water your yard? Let's break it down.
Factors to Consider for Winter Watering in Owens Valley in 2025
1. Your Landscape's Soil Type Matters
- In town: Most soils hold about 2-2.5 inches of water per foot of soil.
- Chalfant or alluvial fan areas: These coarse soils hold only about 1 inch or less.
- Other spots: It's hard to say. We have a lot of variability. You'll have to feel the soil or ask us for help. Almost everyone is covered by the 2 options above, though.
This means water needs can vary significantly depending on where you live.
2. Established Native Plants and Drought-Tolerant Shrubs
- Our native plants and drought-tolerant shrubs should be fine without additional water, even in coarse soils. For now.
3. Lawns
- Nice cool-season lawns (the green ones in winter): Likely need water now, regardless of soil type. Without it, the grass may weaken, making it vulnerable to weeds and less able to grow during warm days.
- Bermudagrass lawns: No need to water—Bermuda is dormant and won't use the water.
- Mixed so-so lawns: If it's a mix of cool-season grass and you're not too particular, heavier soils might sustain it for now. However, if we don't get rain or snow by late January, plan to irrigate. For lawns on sandy soil, some water now could help.
4. Trees and Roses
- Established trees: Typically fine. However, young trees or those with roots obstructed by driveways or pavement may need a drink, especially if they lack mulch.
- Roses: These can dry out, especially in sandy soils. If you haven't watered them since November, it's worth checking their soil.
5. Winter Vegetables, Cover Crops, and Container Plants
- Winter vegetables and cover crops: Most aren't actively growing but have shallow roots. No reason to guess: check their soil by digging a little—it's the easiest way to tell.
- Container plants: These will dry out faster and are more susceptible to winter damage. Use your finger to check for moisture or lift the container to gauge its weight.
The Bottom Line
There's no one-size-fits-all rule for winter watering in Owens Valley, but judgment and observation are key.
With the dry conditions this winter, it's worth taking a walk around your yard to check on your plants on sunny day. While they don't need as much water now, some careful attention can keep them healthy until spring if we don't get any rain soon.
If you have questions or want advice about your yard, contact the Inyo-Mono Master Gardeners at immg@ucanr.edu.
