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What little foliage they produce takes as little as four weeks to die back sufficiently for the grass to be cut.
You could also try planting varieties that will be in leaf or flower in front of the daffodils as they die back.
But do wait until the flowers start to die back before you jump in.
When the stems are caught by the frost and die back, cut the plants back to 6in above the soil.
They need lots of humus and die back with the first frost.
Do not cut back the foliage of bulbs that are growing in grass - let it die back naturally and never twist or tie the leaves in knots as this will restrict the flow of sap.
As plants die back, they tend to make offsets - new bulbs - that may take one or two years to reach blooming maturity.
A BY die back I assume you mean that the leaves have fallen off the stems which have gone black or brown at the top.
You divide these plants between the time leaves die back completely (about June) and immediately after bloom (August or early September).
Carol Doust, London Hi Carol, A lot of ornamental grasses die back during winter.
If you don't do this, the plant will be trying to do too much, the quality of the fruit will suffer and eventually the last trusses won't ripen as the plants die back in ten week's time.
Perennials that die back to the ground can be cleaned up and dried foliage composted, or the foliage can be left for frost protection until later in the season.