Late Autumn Flower Garden Jobs: Digging, Planting, Turfing, and Greenhouse Care

Digging: Depth and Organic Matter

Beds and borders for temporary plants need only single digging (one spit deep) if humus and nutrients are renewed annually. Mix in rotted organic matter as you go — spread on surface first or fork in after main digging.

Application rates by soil type: loamy soils (good structure) — 2.5 kg/m² (5 lb/yd²); heavy/clay soils — 3.5 kg/m² (7 lb/yd²), but reduce to light dressing if plants become excessively leafy; sandy/shaly/chalky soils — at least 5 kg/m² (10 lb/yd²) plus mulches through the growing season.

Organic matter = dark, moist, crumbly, odorless decomposed vegetable/animal material. Farm manure is excellent but scarce; garden compost is a great substitute. Alternatives: leafmould, rotted straw, spent mushroom compost, seaweed, poultry deep litter, treated sewage sludge (check heavy metal content), spent hops, or peat.

Single digging suffices for bulbs — they prefer light soil, so work coarse sand or grit into heavy soils at up to 3.5 kg/m² (7 lb/yd²).

Herbaceous perennials root deeply and widely (some 1.5–1.8 m / 5–6 ft tall) and need double digging (two spits deep) with organic matter mixed into both layers. Keep topsoil and subsoil separate; work with two side-by-side trenches to avoid constant climbing in and out. Half-trenching (one spit + forking bottom) is a shortcut but yields inferior results unless soil is exceptional. Double digging is also essential for top-quality sweet peas — even modern bush types flower better and brighter with thorough cultivation.

Rotavators help but smaller models only penetrate ~22.5 cm (8½ in). Repeated use creates a compacted 'pan' below tine depth that must eventually be broken by hand.

Leave dug soil lumpy over winter — rain, frost, and snow will break it down for easy forking in spring.

Soil Preparation for Planting

Some bulbs planted now still flower on time next spring — prepare soil accordingly if not done in mid-autumn.

Planting Bulbs

Tulips can be planted at the start of late autumn — early spring species included — with little loss if delayed. Winter aconites, crocuses, daffodils, narcissi, and hyacinths planted now will flower late but catch up.

Turfing: Instant Lawn

Turf costs ~7× seed but delivers instant lawn without seedling anxieties (birds, weeds, drought, cold, waterlogging, leatherjackets). Laid correctly in suitable weather, it establishes in 2–3 weeks.

Turves: 90×30 cm or 30×30 cm, ~4 cm thick, uniform grass mix, weed-free. Prepare soil in mid-autumn; a week before laying, rake in superphosphate at 30 g/m² (1 oz/yd²). Choose a mild, moist day with rain forecast. Lay first line lengthwise, slightly looped, tap flat as next line goes down — ensures tight fit. Stagger joints (half-turf start on alternate lines) for bonding. Use a standing board to avoid compaction. Don't roll — fill cracks with topdressing or coarse sand, brushing in. End with full-size turves, not strips. Push soil against outer edges to prevent drying.

Mowing and Stopping

Established lawns: one last light cut. Turfed lawns: top 2–3 weeks after laying if needed. Autumn-seeded lawns: first cut may be due.

Sweet pea seedlings not yet stopped: remove growing tip above third leaf pair.

Protecting Tender Plants

Rock plants with woolly/grey leaves need cover against winter wet — sodden roots and soaked leaves kill more than cold. Gravel mulch keeps leaves off soil; cloches above keep them clean. Cloches on Christmas roses encourage petals and prevent mud splash. Agapanthus and Kniphofia benefit from 15 cm (6 in) mulch of leaves, straw, peat, or bracken.

Tidying and Sweeping

Leaves fall heavily — clear from lawns (especially new), small plants (seedlings, rock plants, herbaceous), and ponds. Collect from drives and paths before they rot and turn slippery. General cleanup of autumn gale debris.

Lighting Christmas Bulbs

Bring Christmas-flowering bulbs into light when ~2.5 cm (1 in) of leaf and bud show. Keep cool at ~7°C (45°F) for a few days until leaves green, then gradually warm with maximum light.

Cutting Down Chrysanthemums

As early late-flowering chrysanthemums finish, cut stems to 7.5 cm (3 in) stumps. Place crowns in pots under staging, compost just moist.

Greenhouse Work

Light declines in quantity and quality — keep glass clean and condensation-free. Artificial heat needed most of the time; minimal ventilation to avoid stuffiness. Water mornings only if needed. Remove fallen/decaying vegetation. Watch for greenfly/whitefly pockets, especially on fuchsias, cinerarias, cyclamen. Winter greenhouse is a pest/disease haven — stay vigilant.