Question 1

Why are the leaves on my plant turning yellow?

Accepted Answer

The most common cause is overwatering, especially if the soil stays wet and lower leaves yellow first. Other causes are underwatering, too little light, a lack of nitrogen or magnesium, and pests such as mealybugs. Check the soil moisture and the undersides of the leaves before changing anything else.

Question 2

How often should I fertilize potted plants?

Accepted Answer

During the growing season, most potted plants do well with a diluted liquid feed every two to four weeks, or a layer of compost once a month. Heavy feeders such as tomatoes and hibiscus need more; houseplants need less. Reduce or stop feeding in the cooler months when growth slows.

Question 3

Which indoor plants cope with low light?

Accepted Answer

Money plant (pothos), snake plant, ZZ plant and peace lily all tolerate lower light, though they grow more slowly there. Place them within a few metres of a window, rotate the pot every few weeks, and water less often than you would for plants in bright light.

Question 4

When is the best time to prune flowering shrubs?

Accepted Answer

Prune shrubs that flower on new growth, such as hibiscus, at the end of the cool season or right after the monsoon. Shrubs that flower on last year's wood should be pruned straight after they finish flowering. Always remove dead, damaged or crossing branches first.

Question 5

What potting mix should I use for container plants?

Accepted Answer

Garden soil on its own packs down in pots. A good all-purpose mix is about two parts potting soil or cocopeat, one part compost and one part perlite or coarse sand. Add more perlite for succulents and more compost for vegetables and flowering plants.

Question 6

How do I know when my plant needs water?

Accepted Answer

Push a finger 2–3 cm into the soil. If it feels dry at that depth, water slowly until water runs out of the drainage holes, then empty the saucer. Small pots, terracotta and plants in full sun dry out faster; succulents prefer the mix to dry out completely between waterings.

Frequently Asked Questions