Prevent tip burn by:
1. Limiting the amount of fluoride the plant is exposed to. Many municipalities in the United States add fluoride to tap water to prevent tooth decay.
Tip burn on a tropical foliage plant is a sure sign of salt damage.
Photo Credit: David L. Morgan
Low salt levels should keep your houseplants blooming happily.
Leaf tip burn is a problem common to spider plants, and is usually the result of too much fertilizer, or water that is high in soluble salts. To avoid leaf tip burn, do not allow plants to become excessively dry.
Brown tips or tip burn can occur when the soil is kept too dry or hard/fluorinated water is used.
Tip burn is usually caused chemicals in the water.
If you are using city water for your plants it has been chlorinated, and very likely has been treated with fluoride as well, either of which chemical will cause the tip burn.
It may cause tip burn, so test it on one plant first. Add one ground-up garlic bulb or large onion to 1 qt. of water with 1 tbsp. of cayenne pepper and let it sit for at least one hour.
Heavy fertilizing of container plantings can lead to tip burn on fruits and vegetables; this can be a symptom of salt buildup. Remedy this by leaching with top watering and going easier on the fertilizer.
Contributes to blossom end rot in tomatoes, tip burn of cabbage and brown/black heart of escarole & celery.
Sources: Any compound containing the word 'calcium'. Also gypsum.
Brown spots may appear along the edges and grow toward the center of the leaves. Blossom end rot in tomatoes and peppers, black heart in celery and internal tip burn in cabbages are all signals to add calcium to the soil.
If your plants suffer from yellowing leaves, tip burn, stem or cane dieback and general weakness, these point to chemical imbalances in the soil.
 See also: Plant, Gardening, Grow, Water, Light
  
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