Allow the top 2-3 cm of soil to dry out between waterings. Overwatering can lead to root rot. Water thoroughly until it drains from the bottom of the pot, then discard any excess water.

Reduce watering in winter when the plant's growth slows.

Prune to maintain shape, encourage bushier growth, and remove spent flowers. Pinch back young stems to promote branching. After flowering, trim back overgrown stems to about half their length.

Remove any dead or yellowing foliage promptly.

Propagate Pelargonium grandiflorum from stem cuttings taken in spring or early summer. Select healthy, non-flowering shoots, cut them to about 10-15 cm, and remove lower leaves.

Dip the cut end in rooting hormone and insert into a moist, well-draining potting mix.

Repot every 1-2 years or when the plant becomes root-bound, typically in spring before new growth begins. Choose a pot that is only slightly larger than the current one.

Use a well-draining potting mix, such as a blend of potting soil and perlite or sand.