Mammillaria spinosissima

Spring-Autumn · Indoors

Cactus fertliser

Feed this plant with a specialist cactus fertiliser.

Spring-Autumn · Indoors

Feed occasionally

This plant doesn't need too many nutrients. Feed occasionally in the growing season. Don't feed in winter. Follow the feed manufacturer's directions for the amount of feed to use.

Indoor temperature · Planting

Min 10C/50F, not kitchen/bathroom

This plant will thrive in warm, average and cool rooms as long as the air is not humid, so avoid placing in bathrooms and kitchens. The minimum advisable temperatures at night and in the colder months are 10C/50F.

Compost · Planting

Cactus compost for repotting

Use standard cactus compost. Top the soil with grit or granite chips to ensure perfect drainage around plant stem. Repot when the plant is dry and delay watering for 3 days after repotting.

You can also make own compost using 3 parts John Innes no. 2, 1 part horticultural grit, and 1 part horticultural grade perlite or pumice. There are many 'recipes' available and opinions vary widely - consult specialist literature or websites.

Indoor plant · Planting

Position in a sunny spot, eg windowsill

Give this plant a position where there is as much light and sunlight as possible. It is suitable for sunny windowsills as it can cope with high day temperatures and lower night temperatures.