How often to water yucca

The interval

A yucca is watered about every 14 days in the growing season and about every 30 days in winter, once the compost has dried most of the way through. Growing season means the warm, bright months from spring to early autumn, roughly March to September in the northern hemisphere and September to March in the southern. Winter is the cold, short-day part of your own year. The Royal Horticultural Society asks for free watering in the growing season, letting the top 5 cm of compost dry out between waterings, and for sparing water in winter.

Weight and a skewer are better than a finger. After a thorough soak, lift the pot and note the feel, and lift it again a week later. A pot that is light is ready, and one that still feels heavy is not. In a deep pot, push a wooden skewer to the bottom and check that it comes out dry. A tall yucca sits in a heavy pot to stop it toppling, so the difference between wet and dry is small, and the skewer settles it.

Soak and dry means watering slowly over the compost until it runs freely from the drainage holes, letting it drain, putting the pot back and leaving it alone. The RHS suggests adding 20 to 30 percent extra grit to the compost for containers. Humidity is low for this plant and it needs no misting.

Too much water shows as the RHS describes it: sudden yellowing and limpness of the lower leaves, and the advice is to cut watering and allow the plant to virtually dry out. Rot follows if it goes on. Too little shows as crisp, brown lower leaves, though some lower-leaf loss is normal as the plant grows. NC State Extension says that overwatering can be problematic and cause root rot.

What is particular to this plant is the cane. It is a water store, and NC State Extension calls the plant drought tolerant, so the plant is far easier to drown than to dry out. A missed week costs it nothing, and a wet fortnight in winter can cost it the cane. Keep it in the brightest place you have, since low light slows its use of water and makes the leaves sag.

Related guides

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The finger, the weight, the leaf and the pot. Four ways to read a plant's thirst, and what overwatering actually is.

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How to tell overwatering from underwatering, how much root damage is recoverable, and the exact rescue steps once compost has stayed wet too long.

Watering through a southern winter

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