The Case for Planting in Layers

Few jobs in the garden repay an hour of autumn effort as generously as planting bulbs. Get them in the ground between September and the first hard frosts and you have bought yourself four months of colour — often in the very beds that look most threadbare in February. The trick that separates a disappointing scattering of daffodils from a proper spring display is layering: putting different bulbs at different depths in the same patch of soil, so that they flower in succession rather than all at once.

This approach suits everything from a small town border to the long herbaceous runs of a country estate, and it works equally well in grass, under deciduous trees and in containers.

Choosing Bulbs and Planting Time

Buy firm, heavy bulbs and refuse anything soft, mouldy or already sprouting. As a rule, plant at three times the bulb's own height: small bulbs such as crocus, muscari and scilla at 5–8cm; daffodils and most narcissi at 10–15cm; tulips and alliums at 15–20cm or deeper. Depth matters more than you might think — shallow planting is the main cause of bulbs flopping, splitting and failing to return.

Timing varies by type:

• September to October: daffodils, crocus, muscari, scilla, alliums, fritillaries.
• October to November: most tulips, planted later to reduce the risk of tulip fire and basal rot.
• November to December: tulips can still go in, provided the ground is workable.
• Snowdrops and winter aconites settle far better bought "in the green" and planted straight after flowering in March.

Add a handful of grit to each planting hole if your soil is heavy clay, and a light dusting of bone meal or a slow-release bulb fertiliser. Never let bulbs sit in a waterlogged pocket over winter.

The Layering Method in Borders

Layering is simple, and it doubles or triples the number of flowers a given square metre will produce. Dig out a trench or a generous planting pocket to around 25cm deep, then work upwards.

• Bottom layer, 20cm deep: tulips, alliums and camassia — the tall, late performers.
• Middle layer, 12cm deep: daffodils and narcissi, which give you the backbone of the display from March.
• Top layer, 5–8cm deep: crocus, muscari, scilla, puschkinia and small iris, scattered across the surface before you backfill.

Backfill gently in stages, firming each layer with your hands rather than your boot. Space bulbs roughly twice their own width apart; in a border you can crowd them a little more tightly than the packet suggests, as the foliage will knit together and smother weeds.

This layering also works beautifully in pots. Use a generous container with crocks and grit at the base, build the same three tiers, and water sparingly until growth appears. A single large pot layered this way will out-perform a dozen tired bedding trays.

Naturalising in Grass and Beneath Trees

For parkland, orchard edges, verges and the rougher grass beyond the lawn, naturalising is the most rewarding approach. Choose bulbs that reliably come back: Narcissus pseudonarcissus, N. poeticus, 'Actaea' and 'Ice Follies' are all dependable, as are crocus, snowdrops, fritillaria and snake's head fritillary in damper ground.

To get an authentic drift, tip a bucket of bulbs into a barrow and scatter them across the area, then plant each one where it lands. Straight lines look municipal; irregular clumps of odd numbers look as though they have always been there. Under deciduous trees, plant in the drip-line where the soil is drier in summer, but avoid the dense shade of evergreens.

The one rule with grass is patience. Do not cut the lawn or meadow until at least six weeks after the last flowers fade — the leaves are feeding next year's bulb. Where daffodils naturalise, that usually means early June.

Building a Succession of Colour

Aim to have something in flower from late January to late May, and plan your order of march accordingly.

• January to February: snowdrops, winter aconites, early crocus and Iris reticulata.
• March: the main crocus flush, muscari, scilla and the first narcissi.
• April: daffodils at their peak, with fritillaries and the earliest tulips.
• May: tulips, alliums and camassia, carrying the border into the herbaceous season.

In formal bedding schemes, treat tulips as annuals and lift them after flowering for a fresh display each year. In borders and grass, choose species tulips — Tulipa sprengeri, T. sylvestris and T. turkestanica — if you want them to persist.

Aftercare and a Word on Scale

Deadhead larger bulbs as the flowers fade, but leave the stems and foliage intact. Never tie daffodil leaves in knots; the leaf is the factory, and bending it reduces the bulb's store for the following year. A feed of sulphate of potash at this stage helps ripening.

Squirrels, mice and slugs are the usual culprits. Plant deeper than feels comfortable, lay chicken wire just below the surface over newly planted beds, and set slug barriers before the first shoots break ground.

On a larger estate, the sensible approach is to work in phases — one avenue, one terrace border, one meadow strip each autumn — rather than attempting the whole grounds in a single season. Bulbs are forgiving, cheap and quietly permanent. Plant them well this autumn and the garden will greet you, year after year, just when you need it most.