Newly planted lavender: the first-summer watering mistake that does the most damage
In late summer, a newly planted lavender still needs help to establish, but too much water is the bigger risk in free-draining soil. The key is when to ease off and what “deep but infrequent” actually means in practice.
For a newly planted lavender in free-draining soil outdoors, the aim in its first summer is to keep the rootball from drying out while avoiding constantly wet conditions. Lavender copes much better with a proper soak and then a partial dry-down than with frequent light watering.
What to do now
Give it a thorough watering every 2–3 days for roughly the first 2–3 weeks after planting. Water slowly so the rootball and the soil around it are both wetted, because new plants often dry out in the original compost even when the surrounding ground seems damp.
Once it has started to settle in, reduce watering to about once a week if the weather is dry. If you get a hot, windy spell and the soil dries very fast, water a bit sooner; if the soil is still damp a few centimetres down, wait.
What to avoid
Do not give it small daily splashes. That encourages shallow roots and keeps the base too damp, which is the main problem for lavender in its first season. By late summer, keep watering only as needed to help establishment, not to keep the soil constantly moist.
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