As the temperatures drop and the light fades, it’s time to rethink how you care for your cacti and succulents. These drought-loving plants have adapted perfectly to long, dry seasons — but in the UK, our cool, low-light winters can make watering tricky. Too much moisture at the wrong time of year is one of the quickest ways to lose an otherwise healthy plant.
At Green + Grounded, we believe that caring for plants means tuning in to their natural rhythms — and that includes giving them a well-earned winter rest.
Why You Should Water Less in Winter
During winter, most cacti and succulents enter dormancy. Growth slows right down as daylight hours shorten and temperatures fall. Because they’re not actively growing, they need far less water than in spring or summer. Overwatering during this period can lead to root rot or fungal issues, especially when the soil stays cold and damp for too long.
How Often to Water (UK Conditions)
From late October to early March, reduce watering dramatically. For most indoor cacti and succulents in the UK:
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Water once every 4–6 weeks, if at all.
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Always check that the compost is completely dry before watering.
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If your plants are in a cool room or conservatory, stretch intervals even further.
When in doubt, remember this golden rule: it’s always safer to underwater than to overwater in winter.
Euphorbia and Other Cacti That Don’t Need Water
Some species prefer to stay completely dry until spring. Many Euphorbia varieties and true desert cacti (such as Mammillaria or Echinocactus) need no water at all through winter. These plants store enough moisture to last until growth restarts in warmer, brighter conditions. You can begin gentle watering again when you notice new buds or growth in early spring.
Winter Care Tips for Healthy Plants
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Keep them bright: Place on a sunny windowsill or under a grow light if needed.
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Avoid cold drafts: Don’t position near open windows or unheated glass.
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Use well-draining soil: A gritty cactus mix prevents waterlogging.
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Skip the feed: Hold off on fertiliser until spring growth begins.
Spring: Time to Wake Up
As the light returns and temperatures rise, your plants will gradually “wake up.” This is the perfect moment to increase watering slightly, check for new roots or shoots, and repot if needed.
By giving your cacti and succulents a proper winter rest, you’ll help them stay strong, disease-free, and ready to thrive again come spring.