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1. Does anyone know what type of cactus this is?
2. Why has it turned red and closed up?
3. How can I revive it?
Its kind of been neglected but I've started watering it once a week and moved it into the conservatory, its mid spring here so maybe its just a winter thing?
How often should I water it and do I water the soil directly or the plant itself and let the water trickle down? We have hard water here hence the white deposits.