Cacti turn brown due to a variety of reasons, including overexposure to sunlight, lack of water, or disease. When cacti are exposed to excessive sunlight, they can become sunburned, causing their green skin to turn brown. Additionally, if a cactus is not receiving enough water, it may start to dry out and turn brown as a result. Finally, cacti can also turn brown due to fungal or bacterial infections, which can cause discoloration and decay of the plant tissue. **

Brown, dry tips on houseplant leaves are often a sign of underwatering or low humidity. When the soil dries out too much, the plant can't take up enough water to support all of its leaves, leading to browning at the tips. Additionally, if the air in your home is too dry, the plant may struggle to retain enough moisture, resulting in the same issue. To remedy this, make sure you are watering your plants consistently and providing adequate humidity by misting the leaves or using a humidifier. Additionally, consider repotting your plant into a container with better drainage to prevent waterlogged soil, which can also cause browning. **