Grass is one of the best planting partners for bulbs because the bulbs’ foliage will be completely camouflaged as it dies down. The drawback of growing bulbs in grass is that you cannot cut the grass for six weeks after the bulbs have flowered (chop off the foliage earlier and next year's flowering will be adversely affected).
So if you want to start mowing by the end of May you will have to choose early-flowering bulbs, such as snowdrops and early crocus that will finish flowering by mid-April.
However, if you are prepared to leave the grass rough until the middle of June, you could also plant dwarf narcissi. Most people think of naturalised bulbs in grass, but you can also scatter them at the base of hedges, amongst shrubs and under the canopy of deciduous trees.
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