We inherited a bowlful of finger-like little cacti 10 years ago, which now and again suddenly spring into bright orange flower - wonderful. The trouble is the bowl keeps producing 'babies' who are determined to leap out of the bowl to set up home elsewhere. When they are retrieved from the floor and sat in another pot they go mad in there. Consequently we have several other plants with 'babies', or are they 'cuckoo cacti', growing where they weren't intended. In general plants either like us or hate us. The same in the garden, where we are overrun with yuccas, evening primroses and something we called 'paint plant' (aluminium plant?).