How often should I water a cactus in winter?

Depends on your home temp. If it's warm and dry indoors, light watering once a month. If you keep them cool (10-15°C), don't water at all.

The real trick is checking the soil moisture before you even think about watering - stick your finger like two inches down and only water if it's bone dry, which in winter might mean going 6-8 weeks between waterings depending on your setup.

I learned this the hard way with my first collection, killed a few by overthinking it, but honestly the safest move is to let them dry out way more than you think they need to.

I learned this the hard way last winter when I nearly killed two of mine by overthinking it.

The soil check method is genuinely your best friend here - I just stick my finger in and if it feels even slightly moist an inch or two down, I skip watering. Mine live in a cooler corner of my place and I probably water them once every 6-8 weeks, sometimes longer.

The key thing I noticed is that once you stop the frequent watering cycle, the plants actually look healthier and plumper going into spring, which is wild because you'd think they'd be thirsty.

What's your indoor temperature actually sitting at during winter months? That matters way more than any generic schedule.

The soil moisture test is where it's at - literally just poke your finger down an inch or two before even considering water. In winter, especially if your place stays cool, cacti can go absolutely ages without needing anything. My collection sits by a window that gets chilly at night, and most of mine go untouched from November through February. I water maybe once in that whole stretch, and only if the soil is completely parched. The risk of root rot in cold, wet conditions is real and brutal.

Temperature is the wildcard though. If you're running your heat and keeping things around 20°C or higher indoors, your cacti might actually want a light drink every month or so since the air gets drier from heating. But if you're keeping them cooler - or near a window where it genuinely gets cold - then you're basically in dormancy mode and watering can actually be harmful. Start by checking your soil before anything else. If it's dry several inches down, you can water lightly. If there's any dampness, leave them alone. Your first winter is the time to let them tell you what they need rather than sticking to a watering calendar.

Winter watering comes down to dormancy, not a fixed schedule - most cacti genuinely stop growing when temperatures drop and daylight shortens, so they need almost no water. The soil-moisture-check method that's been mentioned is solid, but I'd push back slightly on the "once a month" suggestion for typical indoor setups: if your place stays warm year-round (above 15°C or so), you might water lightly every 4-6 weeks, but if it's cooler, you're better off stretching it to 8+ weeks or skipping winter watering entirely. The safest move is to let the soil dry out completely between waterings and err on the side of doing less - a slightly thirsty cactus survives; a waterlogged one in cold conditions rots fast and there's no coming back from that.