Every now and then we get other species such as konjac and nepalense in stock or as offshoots of our own plants - rare events so the availabilty is patchy.
To plant these corms and tubers, you will need a relatively wide pot, at least 4 times wider than the corm. If potting several corms, allow sufficient space for the corm to double in size, in this way they can stay in the same pot for a couple of seasons.
To plant them, there is a 'right' way up and a 'wrong' way. The right way is with the domed side uppermost. If there is no obvious domed side, not to worry as planting the wrong way, the corm will still send a shoot up and its roots down and sideways. Plant each corm to at least its own depth in compost. Free draining compost is ideal, either soil or peat based. If using peat based, add some perlite or vermiculite so that it is easily re-wet after the winter rest.
Warm, bright but out of direct sunlight until the leaves are full developed - so under the shade of shrubs or on the greenhouse floor.