It is refreshing to see such an authority as Nick de Rothschild bring some reality to this incredibly traditional view. The worst effect of clay pots to certain bulbs is the refrigerating effect: it cools down when watered and heats as mix dries. This is a long list but I grow my bulb collection (and allied plants) comprising thousands of them, all in plastic. Not a single one in clay and all do perfectly well. Of course the mix in them is very well drained and most important drainage holes are carefully cut. GENERA Hippeastrum, Eucharis, Phaedranassa, Nerine, Brunsvigia, Cyrtanthus, Amaryllis, Cypella, Gelasine, Trimezia, Sternbergia, Pancratium, Narcissus, Tulipa, Geranium, Crocus, Scilla, Ornithogalum, Sparaxis, Leucojum, Albuca, Brodiaea, Muilla, Stenomesson, Ipheion, Sinningia, Alstroemeria, Biarum, Arum, Eminium, Ambrosina, Allium, Lilium, Oxalis, Melasphaerula, Ixia, Babiana, Tritonia, Watsonia, Drimiopsis, Ledebouria, Moraea, Romulea, Gladiolus, Drimia/Urginea, Crossyne, Strumaria, Hessea, Ammocharis, Hypoxis, Spiloxene, Rhodohypoxis, Haemanthus, Zephyranthes, Hymenocallis, Massonia, Ozyroe, Habranthus, Boophone, Ranunculus, Nothoscordum, Hyeronimiella, Portulaca, Crinum, Herbertia, Alophia, Calochortus, Freesia, Pelargonium, Clinanthus, Ismene, Leptochiton, Anemone, Eleutherine, Triteleia, Dichelostemma, Sprekelia, Milla, Ferraria, Chasmanthe, Crocosmia, Tulbaghia, Rhodophiala, Phycella, Conanthera, Tecophilaea, Manfreda, Polianthes, Cyanella, Eriospermum, Acis, Galanthus, Colch icum, Baeometra, Onixotis, Cyclamen, Eucomis, Daubenya, Hesperantha, Geissorhiza