One of the most common questions this time of year is "Why are the tips of my houseplants turning brown?". Indoor plants hate change, which is why they seem to pout when you first bring them home from the nursery. Problems can be caused by anything from too little water to too much. Browning leaves are often an indication that the plant is dry, but when the browning uniformly starts from the leaf tips and watering doesn't help, it's a good bet that your plants are suffering from low humidity.
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Photo: © Marie Iannotti
Comments
Tips of plants often turn brown because of the chlorine and flouride in public water. Use filtered water to water your plants.
That’s a good point. You can usually thwart this by letting water sit in your watering can overnight and allowing the gases to escape enough to avoid damage.
I think they need more nutrients.
Sounds like (looks like) a calcium deficiency