Rick: I have my potful of Gethyllis linearis in a sandy mix. The roots can reach down into some commercial potting mix but the bulb is in a blanket of sand. Has flowered reliably for two years . Neck of the bulbs is at soil level. Arnold New Jersey On 03/17/14, Rick Buell wrote: I'm going to be potting up bulbs of g.spiralis that I received recently and I have 2 questions: 1) is the potting mix you're about the same as for albucas, and 2) should these be in a deeper pot of maybe 8" depth, with the top of the bulb about 1.5" under the surface? I have been using a combination of scoria and cactus medium for many albucas, but have heard that they can be planted in plain sand with little else.