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Inherited Cactus Plants

in Plants
Hello!
I inherited these 6 Cacti plants from somebody that I work with as they belonged to one of their relations. However due to my co-worker not "being into" plants and Cacti being something that I haven't been too interested in previously I could do with some help identifying them.
Also if you have any growing tips they are more than welcome Many thanks!
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The white one looks like Mammillaria vetula ssp. gracilis cv. Arizona Snowcap.
The one on the left is a type of Opuntia.
The British Cactus and Succulent Society should be able to give more help.
http://www.bcss.org.uk/foruma/viewforum.php?f=1
As for cultivation, do not water at all in Autumn and Winter, This dormancy will stimulate flowering next Spring. Only water when the compost is almost bone dry, so at least a week between watering. Feed occasionally with tomato fertiliser, one quarter strength, or specialist cactus fertiliser.
Thanks Alan