Questions and answers

Push a finger into the soil near the edge of the pot. If the top layer is dry and your species is not one that likes constant moisture, you can water. If the soil feels cool and damp, wait and check again later.

In soggy soil the roots do not get enough air and start to rot. As a rule, overwatering is the most common reason beginners lose their plants. A plant that has dried out is usually easier to save than one that has been overwatered.

Usually, yes. If water sits in the saucer for a long time, the bottom of the root ball stays wet. Wait a little after watering and pour away what is left, unless the description of your species advises otherwise.

Many plants grow more slowly in winter and drink less, so watering is usually cut back. Do not switch to a new schedule by the calendar: keep going by how dry the soil is and by what your species needs.

A north-facing window gets less light, but many shade-tolerant plants are perfectly content there. Choose species that do not need direct sun, and place them close to the glass rather than deep inside the room.

The stems stretch out and lean towards the window, new leaves come in smaller and variegated patterns fade. Try moving the pot closer to the light, but do it gradually so the leaves do not scorch.

It is better not to place a pot directly above a hot radiator: the soil dries out faster there and the leaves suffer in the dry, warm air. If there is nowhere else, check the soil more carefully.

Many plants dislike frequent changes. Once you have found a spot where your plant is happy, leave it there. Turning the pot so the other side faces the light can help now and then, but again, without rushing.

Each time you water, look at the undersides of the leaves, the leaf joints and the stems. A sticky film, fine webbing, small spots or little flies above the soil are reasons to look closer. If you find them, move the plant away from the others straight away.

Pests often arrive along with a new purchase. If you keep the newcomer apart for a few days, you have time to spot them before they move on to neighbouring pots.

Some popular houseplants are toxic to animals. Lilies (genus Lilium) are especially dangerous for cats, and dieffenbachia sap irritates the mouth and throat. Check each species against the ASPCA materials, and if you suspect poisoning, call a vet at once.

Put pots where a toddler cannot reach them, and find out in advance whether any of your plants are irritating or toxic. Explain to older children that leaves are not for tasting, and if a child has bitten something, contact a doctor.