aplant as many crocus bulbs as i can in all the feilds around where my hives are
Generally there are two types of crocus, the large flowered ones and the 'species' ones.
Large flowered are bred for the size of petals. They are fussier about conditions and cost more. If you want them to flower in subsequent years, they really need gentle treatment and feeding. Bee friendly features like lots of pollen didn't feature in the breeding, so no reason to suggest they have any advantage that I'm aware of.
Species crocus are closer to the wild varieties. Since they are cheaper you get more for your money. They are also more likely to be successful naturalising in the grass with minimal attention. Crocus varieties do have slightly different flowering times, the ones I have tend to flower yellow first then the purples so mix to get as long a flowering period as you can
RAB's right, botanically they are corms rather than bulbs, but cultivation is much the same. Planting in grass the usual recommendation is to slice off the turf with a spade, place the corms and replace the turf on top. The usual planting depth is 2 to 3 times the height of the bulb or corm. In grass any spring flower is less prone to drying and root competition if they are at the deeper end of that scale, a 2cm corm at 6cm deep would be about right. Less likely to be dug up by squirrels etc too if they deep under turf.
Finer grasses provide less competition than coarse if you have any choice. Mow late as you can in the year to reduce the grass cover. Don't mow until the leaves have died down after flowering, 6 weeks or so. And if you can, a light feeding with a general fertiliser when you first see them emerging can help them build up the corms for next year.
