The bottom of the corm is flattened. Don't worry too much about which side is up during crocus flower care and planting; crocuses have contractile roots which just means they will adjust their position downward if they feel the need.
The rule of thumb is three times their own depth, so for a 5cm (2in) daffodil bulb, that's a hole 15cm (6in) deep. But don't worry if you've done it wrong because bulbs will 'drag' themselves to the correct depth using contractile roots.
 See also: Plant, Flower, Soil, Growing, Produce
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