How often should they be watered? How much? Any parts that need cutting off? I have one potted plant which is pretty grown. And has pink flowers.
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Pelargoniums are very low maintenance, drought resistant, and don't need much water. You can water them when the soil is dry to the touch.
You can remove dead flowers, dead branches and dead leaves, if any.
If the plant is fully grown, you can propagate the plant by simply using stem cuttings, and thus trim your plant down.
Alternately, you can re-pot the plant in a larger pot.