How to Water Cacti Correctly

Cacti: The Ultimate Drought Survivors

Cacti are among the most drought-tolerant plants on earth. They've evolved to survive months without rain in desert environments by storing water in their thick stems. This means the most common mistake with cacti is overwatering — not underwatering. Less is almost always more.

The Soak and Dry Method

Like succulents, cacti thrive with the "soak and dry" watering method: water thoroughly, then wait until the soil is completely dry before watering again. The key difference from most houseplants is how long you wait — cacti need the soil to be bone dry, not just slightly dry.

How to Know When to Water Cacti

Use a soil moisture meter for the most accurate reading. Insert the probe into the soil and only water when the reading is firmly in the "dry" zone. For cacti, you want the soil completely dry all the way through — not just the surface. No battery needed.

How to Water Cacti: Step-by-Step

1. Confirm the soil is completely dry: Check with a moisture meter
2. Water thoroughly: Use a watering can with a long, narrow spout to direct water to the soil base, avoiding the cactus body. Water until it drains freely from the drainage holes
3. Drain completely: Empty the saucer immediately. Cacti are extremely sensitive to standing water
4. Wait until bone dry: Don't water again until the soil is completely dry throughout

How Often to Water Cacti

• Spring and summer (growing season): Every 2–4 weeks
• Fall: Reduce frequency as temperatures drop
• Winter (dormancy): Once a month or less — some cacti need no water at all in winter

The Right Soil Is Critical

Cacti must be planted in fast-draining soil. Regular potting mix retains too much moisture and causes root rot. Use Miracle-Gro Cactus, Palm and Citrus Potting Mix, which is specifically formulated for the fast drainage and low-moisture conditions that cacti need to thrive.

Signs of Overwatered Cacti

• Soft, mushy spots on the cactus body
• Brown or black discoloration at the base
• Cactus leaning or falling over
• Foul smell from the soil

Signs of Underwatered Cacti

• Shriveling or wrinkling of the cactus body
• Cactus feels lighter than usual
• Ribs becoming more pronounced (the cactus is deflating)

Final Thoughts

Watering cacti correctly is about restraint. Water thoroughly but infrequently, use a moisture meter to confirm the soil is completely dry before watering, use fast-draining cactus soil, and never let cacti sit in standing water. When in doubt, wait longer — cacti can handle drought far better than overwatering.