Yellow leaves
Likely causes
Most often: too much water, or a potting mix that no longer dries out. Sometimes lack of light, or an old leaf dropping naturally.
First step
Feel the soil a few centimetres down. Damp? Stop watering and empty the saucer. Just one old lower leaf? Nothing to worry about.
Read: Yellow leaves: why is my plant turning yellow
Brown, dry edges or tips
Likely causes
Air that's too dry (air conditioning, heating, chergui wind), very hard water, or soil that dries out completely between waterings.
First step
Move the plant away from air vents, use water that has been left to stand, and raise the humidity around it with a fine mist sprayer.
Read: Tap water and houseplants
Little bugs, webbing or sticky residue
Likely causes
Mealybugs (white cottony clusters), aphids (on young shoots), spider mites (fine webs, dull speckled leaves), thrips (silvery marks).
First step
Isolate the plant. Clean both sides of the leaves, then spray our ready-to-use black soap for plants, repeating every few days.
Read: Mealybugs · Thrips · Spider mites
Soft leaves, drooping plant
Likely causes
Thirst, if the soil is dry. If the soil is wet and the base is soft: rotting roots.
First step
Dry soil: water thoroughly and it will perk up within hours. Soggy, foul-smelling soil: the roots need checking, so bring the plant in.
Read: Repotting a houseplant
Long stems, small pale leaves
Likely causes
Lack of light: the plant is stretching towards the window.
First step
Move it closer to a window, out of direct midday sun. New growth will be more compact; leggy stems can be cut back.
Read: Bright, indirect or low light?
Brown or black spots on the leaves
Likely causes
Sunburn (dry, pale spots on the window side), overwatering (soft, dark spots), or cold.
First step
Cut off badly damaged leaves, move the plant if it's in direct sun, and let the soil dry before the next watering.
Read: Getting watering right
Gnats around the pot
Likely causes
Small fungus gnats: their larvae live in soil that stays damp on the surface.
First step
Let the top few centimetres of soil dry out between waterings, water from the saucer, or cover the surface with pozzolana.
Read: Fungus gnats
No new growth at all
Likely causes
Winter (that's normal), a pot that's too small, exhausted potting mix, or not enough light.
First step
In spring and summer, feed with the compost tea root feed. If roots are coming out of the pot, it's time to repot.
Read: Repotting at the studio
One change at a time: if you move the plant, change the watering and add fertiliser on the same day, you won't know what worked. And when in doubt, don't water: a plant recovers faster from too little water than from too much.