Blueberry plant leaves turning yellow?
On blueberries, yellow or red leaves in autumn can be normal before leaf drop, but yellowing during the growing season usually means high-pH soil, water stress, root trouble, weather injury, or chemical damage.
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The causes in full
High-pH soil causing iron chlorosisMOST COMMON
How to tell
Check whether the newest tip leaves are yellow while the leaf veins stay greener, then test the soil pH; blueberries need strongly acidic soil, about pH 4.5 to 5.5.
What to do
If the pH is too high, apply elemental sulfur according to a soil test or local extension guidance, and avoid lime, wood ash, and alkaline composts. If soil 2 inches down feels dry and crumbly, water deeply; otherwise focus on correcting pH rather than adding more water.
Drought and heat stressCOMMON
How to tell
The soil feels dry or hard, leaves may droop or scorch, and yellowing is worst on the hot afternoon-sun side or across the bush after hot, dry weather.
What to do
If soil 2 inches down feels dry and crumbly, water deeply and slowly over the root zone, then add 2 to 3 inches of pine bark, pine needles, or other acidic mulch without piling it against the stems. During extreme heat, temporary afternoon shade cloth is okay, but keep blueberries in full sun overall.
Waterlogged soil or Phytophthora root rot diseaseCOMMON
How to tell
The soil stays wet after rain, the whole plant looks weak or yellow, and roots checked near the edge of the plant are brown or black and soft instead of pale and firm.
What to do
Do not irrigate unless soil 2 inches down feels dry and crumbly. Redirect runoff, pull mulch back if it is keeping the crown wet, improve drainage where possible, and remove badly declining plants if roots are rotted through.
Nitrogen deficiencyLESS COMMON
How to tell
Older lower leaves yellow first, growth is weak, and there is no clear wet-soil, heat, frost, or spray pattern.
What to do
Feed in spring with a blueberry fertilizer or another acid-forming fertilizer at the label rate; do not keep adding fertilizer late in summer or fall. If you are unsure, test the soil first because high pH can look like a nutrient shortage even when nutrients are present.
Late frost or cold injuryLESS COMMON
How to tell
Tender new leaves, flowers, or shoot tips turned pale yellow, tan, or black right after a cold night, while older protected leaves look better.
What to do
Wait until you can see what is dead, then prune only the dead tips back to healthy wood. Do not fertilize hard right after frost, because a flush of soft new growth is easily damaged again.
Herbicide drift or fertilizer burnLESS COMMON
How to tell
Yellowing appears suddenly after lawn weedkiller, driveway spraying, overspray, or heavy fertilizer use, often with twisted new growth or damage on the side facing the spray or treated area.
What to do
Stop using herbicides near the blueberry root zone, remove any fertilizer granules sitting against stems or on mulch, and do not add more fertilizer until new growth is normal. If soil 2 inches down feels dry and crumbly, water deeply to move excess fertilizer salts down; if it is damp or waterlogged, do not add more water.
Will it recover?
Leaves that have turned fully yellow, scorched, or frost-burned usually do not turn green again; the goal is healthy new growth after the cause is fixed.
Stopping it happening again
Keep blueberries in full sun with acidic soil, good drainage, acidic mulch, careful fertilizer use, no herbicide drift, and water when soil 2 inches down feels dry and crumbly.
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