There are varying degrees of recalcitrance in this kind of seed. Some do not tolerate any drying, and a day or two of drying is fatal (many willows). Some survive for a few weeks, some for a few months. The bottom line is that they won't tolerate the drying that seeds you buy at a store endure. Most ephemeral plants produce seed in this category, like Corydalis, Hepatica and most Clatonia. Acorns and chestnuts are recalcitrant. There are many more, and it includes most tropical seeds.
Larkspur are delphiniums, and I didn't think any delphiniums produce recalcitrant seeds. Evelyn, where did you find this datum?
