Why is my Lavender dying?
Lavender usually dies because the roots are too wet for too long, but dry heat, frost, and spray or fertiliser damage can look similar at first.
Answer what you can see
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The causes in full
Waterlogged soil and Phytophthora root rot diseaseMOST COMMON
How to tell
Check whether the soil is wet or still damp two inches down, the lowest older leaves are yellowing or grey, and stems near the base are browning or going soft after rain or poor drainage.
What to do
If the soil is waterlogged or damp two inches down, withhold irrigation and redirect sprinklers, roof runoff, or drip lines away from the plant. Remove dead stems, open the area around the crown so it can dry, and if the base is mushy or roots are brown and rotten, replace the plant in a raised, sharply draining spot rather than trying to nurse it in wet soil.
Drought stress in dry or compacted soilCOMMON
How to tell
Check for soil that is dry two inches down or baked hard, with limp, grey, crispy tips or whole-plant dullness rather than soft black stems at the base.
What to do
If the soil is dry two inches down or baked hard and cracked, water slowly at the base until moisture soaks several inches deep, then wait until the top couple of inches dry again before watering. Break the crust gently around, not through, the roots and use a thin gravel or mineral mulch to reduce baking without keeping the crown wet.
Heat scorch on the afternoon-sun sideCOMMON
How to tell
Look for browning mainly on the west or afternoon-sun side while the shaded side looks better, especially after scorching days or reflected heat from paving, walls, or gravel.
What to do
If the soil is dry two inches down, water deeply once in the morning; if it is still damp, do not add more water because scorch can happen even when roots are wet. During extreme heat, give temporary afternoon shade with shade cloth or a screen, then trim dead tips only after the heat breaks and you can see what is still alive.
Cold snap or late frost burnLESS COMMON
How to tell
Check whether the newest soft tips blackened, browned, or collapsed right after a cold night while older woody parts are less affected.
What to do
Do not cut hard immediately; wait until new green growth shows, then trim only dead tips back to live growth. Water only if the soil is dry two inches down, because cold-damaged lavender is easily made worse by wet roots.
Herbicide drift or fertiliser burnLESS COMMON
How to tell
Suspect this if damage appeared within a day or two of weedkiller use, lawn spraying, nearby overspray, or feeding, with twisted new growth, scorched edges, or injury strongest on the sprayed side.
What to do
If fertiliser granules or a recent feed are present and the soil is dry two inches down, water deeply once to dilute salts; if the soil is already damp, do not keep flushing lavender in wet ground. For herbicide drift, stop further exposure, rinse fresh spray residue off leaves with plain water if it just happened, and wait for clean new growth before pruning out dead parts.
Will it recover?
Brown, crispy, blackened, or mushy lavender leaves and stems usually do not turn green again; the goal is to stop the cause and judge recovery by firm stems and new growth.
Stopping it happening again
Grow lavender in full sun with fast-draining soil, keep irrigation off unless the soil is dry two inches down during stress, avoid rich fertiliser, and protect plants from standing water, severe heat, frost, and spray drift.
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