You should water an indoor kalanchoe every 7-10 days during its active growing season. The key rule is to let the soil dry out all the way before you water again. This plant stores water in its thick leaves, so it handles dry soil much better than wet soil. Giving it too much water is the fastest way to kill it.
I found this out with my kitchen kalanchoe. During a hot summer, that plant needed water every 5 days because the warm air and bright window dried the soil fast. But come winter, the same plant sitting next to a cold window only needed a drink every 3 weeks. Your watering routine has to change with the seasons or you'll drown your plant in winter when it barely drinks at all.
Your kalanchoe can survive dry spells because of special cells inside its leaves called hydrenchyma. These cells act like tiny water tanks that keep your plant fed during droughts. This is why your kalanchoe looks fine even if you forget to water it for a couple of weeks. But those same thick leaves trap moisture if you overdo it, and the roots will rot in soggy soil before you notice a problem.
This kalanchoe watering schedule gives you a starting point, but your exact timing depends on your home setup. Terra cotta pots dry out faster than plastic or glazed ones because the clay pulls moisture through its walls. A plant near a heating vent will need water sooner than one sitting in a cool spare bedroom. The size of your pot matters too since smaller pots dry out much faster than large ones. You have to check your soil instead of following a fixed calendar.
Your water source matters more than you might think. Use room temperature water so you don't shock your plant's roots with a cold blast. Tap water works fine for most areas. If your local water is very hard or heavy with chlorine, let it sit out in an open container for 24 hours before you pour it on your plant. This gives the chlorine time to gas off.
The finger test is your best tool. Stick your finger about one inch (2.5 cm) into the soil. If it feels dry all the way down, go ahead and water. If you feel any moisture at all, wait another few days and check again. When you do water, pour until it flows from the drainage holes. Then dump your saucer within 30 minutes so the pot doesn't sit in a pool of water.
Watch for overwatering kalanchoe signs so you can catch problems early. Your first warning is leaves that turn soft, mushy, and see-through instead of firm and green. Next you might spot blackening at the base of the stem right where it meets the soil. That dark mushy area means root rot has already started. If you catch it early, stop watering and let the soil dry for two full weeks before you give it another drink.
The golden rule for your kalanchoe is simple. When in doubt, don't water. This plant bounces back from dry soil with no trouble at all. But once root rot sets in from overwatering, saving it gets much harder. Treat your kalanchoe like the desert plant it is and you'll keep it healthy for years in your home. I've had my oldest one for four years now using nothing more than the finger test and a good drainage setup.
Read the full article: Kalanchoe Plant Care Guide
