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conditions, house plant orchids should be potted in a mix of moss, bark chips and perlite.Orchids living on branches get soaked regularly by tropical storms, but the water quickly drains away, and orchid compost is similarly free-draining. Over the years

pot and splitting the rootball. Cacti that form numerous heads, such as many Mammillaria and Echinopsis can be divided, or cut off individual heads and use them as cuttings.Cactus compostPlastic potsSnips or scissorsTongsMarch - June20 minutesAll year

. The compost should also be watered, but not much – simply ensure it never dries out fully. Add a house plant fertiliser when watering the rosette, though use it at half strength, and only feed during the spring and summer months.When to water and feed a

? Bittercress lives up to its name. It’s often inadvertently imported on the surface of compost of potted young plants, but I don’t make it welcome. It's a pest, albeit a tasty one.Ground elder was the invasive thug we battled with in my childhood garden, though