What are common causes of these burnt tips?
Over/under fertilization? Too much/little light? Nutrient deficiency?
This is Korean shiso/perilla growing in a deep water culture. I've also seen it on basil grown in soil.
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It looks like nitrogen and potassium deficiency to me.
From Chapter 4, Soil fertility and crop production of the book Plant Nutrition for Food Security - A guide for integrated nutrient management published by the Food and Agriculture Organization of the United Nations:
Deficiencies indicated by symptoms appearing first on older leaves
- chlorosis starting from leaf tips, later leaves turn yellowish-brown: N
- reddish/purple discoloration on green leaves or stalks: P
- leaves with brown necrotic margins and/or spots: K
- stripe chlorosis, mainly between veins, while veins remain green: Mg
- spot necrosis: greyish-brown stripe-form spots in oats (grey-speck disease): Mn
- dark-brown spots in oats and barley, whitish spots in rye and wheat: Mn
Deficiencies indicated by symptoms appearing first on younger leaves:
- completely yellowish-green leaves with yellowish veins: S
- yellow or pale yellow to white leaves with green veins: Fe
- youngest leaf with white, withered and twisted tip: Cu
- yellowish leaves with brownish spots and/or leaf deformed (part of acidity syndrome): Ca