Watering Wisely

Coastal Carolina gets 55+ inches of rain a year on average — enough that most established trees never need supplemental watering. That's the good news. The bad news is that when we do get droughts, sandy soil dries out fast, and homeowners with sprinkler systems often over-water in ways that kill trees.

Sprinkler systems don't water trees

Lawn sprinklers deliver light, frequent water — perfect for turfgrass, useless for trees. Tree roots go deeper; you need slow, deep watering that reaches down 12+ inches. A sprinkler cycle of 15 minutes wets the top inch of sandy soil and evaporates.

For trees, use a soaker hose or a slow trickle from a garden hose for 30–60 minutes, once a week during dry spells.

How much water — a rough rule

• Young trees (1–3 years): 10–15 gallons per week during warm dry weather.
• Established trees: 10 gallons per inch of trunk diameter, monthly, during drought.
• Never during heavy rain. Watering saturated coastal soil suffocates roots.

Signs of over-watering

• Yellowing leaves, especially at the interior of the canopy
• Soft, waterlogged soil at the root flare a day after watering
• Fungal growth on mulch or soil surface
• Sudden dieback of branches — often mistaken for drought stress

In sandy soil this is less common than under-watering, but automatic irrigation on trees can absolutely kill them.

Signs of drought stress

• Curling or wilting leaves during hot afternoons
• Premature leaf drop (yellow or brown leaves falling in summer)
• Small leaves the following spring — drought damage often shows up a year late
• Thin canopy over time

The mulch multiplier

A 2–3 inch mulch ring extending to the drip line cuts water needs roughly in half. It moderates temperature, reduces evaporation, and slowly feeds the soil as it breaks down. If you do one thing for your trees this year, mulch them properly (never against the trunk).

Watering into hurricane season

A well-hydrated mature tree resists wind failure much better than a drought-stressed one. If you head into hurricane season after a dry summer, deep-water your mature trees — this is one of the most underused ways to protect them.