I found a tiny pad of this Opuntia near the beach last summer, in the gravel on the side of the road, like it had fallen from the sky, with no roots. It seems happy in mini garden for now.
Everything in this pot was stuck in as a cutting w/o roots. 2 kinds of Plectranthus, Coleus, Tradescantia zebrina, Tripogandra serrulata, Euphorbia tithymaloides, ornamental purslane (Portulaca umbraticola,) Tahitian bridal veil (Gibasis geniculata,)
These plants were all cuttings a few months ago, Hoya 'Chelsea,' Begonia 'Castaway,' dwarf umbrella tree (Schefflera arboricola,) calico plant (Alternanthera ficoidea.)