Troubleshooting
Red Shiso problems — and how to fix them
Red Shiso (Perilla frutescens var. crispa 'Atropurpurea') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Wilting in heat or drought
Leaves collapse dramatically when the soil dries or sun is intense. Keep soil evenly moist, mulch, and provide afternoon shade in hot spells; it usually rebounds after watering.
Prolific self-seeding
Left to flower, it seeds everywhere and can become weedy. Pinch out flower spikes to prolong leaf harvest and prevent unwanted seedlings.
Legginess
Unpinched plants in low light grow tall and bare. Pinch tips regularly from young to force bushy, well-branched, leafier growth.
Frost death
Any frost kills it outright as a tender annual. Harvest before the first cold snap or grow in pots moved indoors to extend the season.
Prevent red shiso problems before they start
Most red shiso issues are care-mismatch, not bad luck. Dial in the basics:
Looking for red shiso in general rather than its problems? Read the full red shiso care guide — light, water, soil and feeding.
Red Shiso problems — FAQ
Why is my red shiso wilting in heat or drought?
Leaves collapse dramatically when the soil dries or sun is intense. Keep soil evenly moist, mulch, and provide afternoon shade in hot spells; it usually rebounds after watering.
Why is my red shiso prolific self-seeding?
Left to flower, it seeds everywhere and can become weedy. Pinch out flower spikes to prolong leaf harvest and prevent unwanted seedlings.
Why is my red shiso legginess?
Unpinched plants in low light grow tall and bare. Pinch tips regularly from young to force bushy, well-branched, leafier growth.
Why is my red shiso frost death?
Any frost kills it outright as a tender annual. Harvest before the first cold snap or grow in pots moved indoors to extend the season.