7 Foxglove Varieties from Sarah Raven for a 10-Metre Cottage Bank

Digitalis purpurea ‘Pam’s Choice’ carries white funnels with a deep maroon throat, and on a 10-metre bank it does something the plainer pinks cannot. It reads as bicolour from the bottom of the slope, where most of the viewing happens. Sarah Raven sells it as seed and occasionally as young plants in spring, and a packet covers far more ground than three nursery pots ever will. Sow it shallow on the surface in April, because the seed needs light to germinate and buries badly if you cover it.

Use the gradient. Put the 1.5-metre spires on the lower part of the bank, then let the 60cm forms sit higher up so the eye reads one stepped planting instead of a row of mismatched poles. A bank exaggerates height because the eye travels along the incline, and tall plants placed on the crest can make the whole slope look top-heavy.

Start with the apricot and cream

Most people reach for ‘Sutton’s Apricot’ after they have filled the bank with standard purple. Put it in first. The soft apricot is the hardest colour to place because it clashes with magenta, and once the magenta forms have seeded themselves around it, the chance for clean neighbours has gone. Surround it with the white ‘Pam’s Choice’ and ‘Camelot Cream’ so the pale tones hold together.

‘Sutton’s Apricot’ grows true from seed about 80 percent of the time, which for a self-seeding biennial is generous. The off-types come out pinker, and you pull those in the second spring before they flower if you want to keep the strain clean. On a bank this matters less than in a tight border, because the slope spreads the colours out and a stray pink looks natural among the other spikes.

This one resents wet feet over winter more than the species does. On a north-facing bank with heavy soil it can rot at the crown in a soggy December. Grit worked into the planting hole, a good 30 percent by volume, keeps the rosette sitting proud of standing water. The bank’s drainage already helps here, which is one reason a slope suits foxgloves better than a flat bed.

‘Camelot Cream’ earns its place beside the apricot because cream calms the warmer tones and gives ‘Pam’s Choice’ a pale companion. Keep the cream forms in loose groups, especially where the bank is most visible from below, because single pale plants disappear between darker purples.

‘Dalmatian Peach’ can sit close to ‘Sutton’s Apricot’ where you want a warmer run without sliding fully into magenta. It also helps bridge the apricot planting into the pinker middle of the bank, especially if the named seedlings begin to throw odd colours after open pollination.

Digitalis x mertonensis earns its perennial label

The strawberry-pink ‘Mertonensis’ is one of the few foxgloves that genuinely comes back year after year, and it forms a clump instead of a single rosette. That clumping habit belongs in the middle third of the bank, because it gives structure between the biennial flushes that come and go.

Divide it every third autumn or the centre of the clump dies out and you get a doughnut of leaves around a bald patch. Lift the whole thing with a fork, split it into fist-sized pieces with at least three growing points each, and replant immediately. It transplants badly if the roots dry, so do it on a still overcast afternoon and have the new holes dug before you lift.

The colour sits oddly next to true purple, so keep a metre of white or apricot between ‘Mertonensis’ and any ‘Pam’s Choice’. Crushed slate or a band of low Alchemilla mollis along the front breaks the colours apart at eye level. The crushed-strawberry tone also fades to a paler pink in full sun, so on the brightest part of a south-facing bank it loses its character by July.

The shade end of the bank

Most 10-metre banks have a shaded end, usually where a wall, fence, or established shrub throws afternoon shadow. Digitalis purpurea is woodland-edge by nature and takes that dry shade better than almost anything else with this much vertical presence. The straight species, sold by Sarah Raven simply as the wild foxglove, self-seeds into exactly these gaps without any help.

Underplant the shaded run with shade-tolerant hosta borders and you cover the ground the foxgloves leave bare in their first year. ‘Halcyon’ with its blue leaves sits well under the purple spires, and the hostas fill out just as the foxglove rosettes are still flat to the ground. The two shapes play cleanly against each other, broad horizontal leaf below vertical flower spike, and the contrast does more for the planting than another spire would.

Slugs are the real fight in this corner. They go for hosta and young foxglove rosettes with equal enthusiasm, and a damp shaded bank is their ideal ground. Wool pellets scattered around each crown in March, refreshed after heavy rain, keep them off long enough for the leaves to toughen up. Nematodes watered on in spring when the soil hits 5C work better but cost more and need reapplying every six weeks through the wet months.

The foxgloves in this end will flower a week or two later than those in sun, which helps. It stretches the bank’s flowering season instead of having everything peak and crash together in early June.

A note on the rusty foxglove

Digitalis ferruginea, the rusty foxglove, throws narrow honey-brown spires up to 1.2 metres and is a true short-lived perennial. It looks nothing like the others, and that is exactly why it belongs on the bank, breaking up the cottage-garden softness with something almost architectural.

Soil prep without digging the bank apart

Digging a 10-metre slope is how you start a landslide and lose your topsoil to the bottom of the garden. No-dig compost layering steps suit a bank far better than turning it over. Lay cardboard over the existing weeds, overlapping the sheets by 15cm so nothing pushes through the seams, then spread 5 to 8cm of well-rotted compost on top. The foxglove seed goes onto that compost layer in autumn or spring.

Spread the compost while working across the slope. A board laid along the contour gives you something to kneel on without compacting the bed or sliding the mulch downhill. On a steep pitch, peg the cardboard with landscape staples or it can slide off before the compost holds it.

The first year the bank looks like a building site with rosettes scattered across bare compost. That is normal. The compost feeds the rosettes through their establishment year, and by the time they bolt into flower the following May the layer has broken down into the soil and the self-sown seedlings have filled the gaps. Top up with another 3cm of compost each autumn and the no-dig system keeps the perennial weeds suppressed without you ever lifting a spade to the slope again.

Watering a bank is its own problem because water runs off before it soaks in. Drip irrigation laid along the contour lines, with the line pinned every metre so it does not slide, puts water exactly where the crowns sit and wastes almost none to runoff. Foxgloves rarely need it once established, but in a dry first spring the difference between a 40-rosette bank and an 80-rosette bank is whether those seedlings got through May without wilting.

Keeping the bank going past year two

A bank planted only with biennials goes spectacular in year two and then collapses to nothing in year three unless seed set the next generation. Deliberately let some spires go to seed. Leave the bottom third of each flower spike standing after the top flowers fade, because that lower section holds the ripest seed, and the spent stem still reads as structure on the slope while the capsules brown off.

Shake the ripe capsules along the bare patches in late summer. The seed is dust-fine, thousands to a spike, and you want it scattered thin across new ground, not dumped in one spot where the seedlings will throttle each other. Mark where the perennial clumps of ‘Mertonensis’ and ferruginea sit so you do not smother them with a carpet of purple biennials.

Cut spent biennial spikes for seed in August, top the no-dig compost in October, and pull off-type seedlings in March before they flower. Miss the March pull two years running and the whole bank drifts toward muddy mid-purple as the strongest self-seeders outcompete the named forms you paid for.

The unresolved tension is in the colour, where self-seeding gives the bank its volume while slowly loosening the pale apricot and cream work into a mixed background.