Growing Conditions · England
Hertsmere Growing Conditions
Soil, hardiness and a planting calendar for Hertsmere — across 5 postcode districts.
Soil
A workable loam-to-clay that drains slowly, so water can pond after heavy rain and roots sit cold in winter. Most shrubs and perennials do well once established; add grit and compost for vegetables, and choose damp-tolerant plants for low spots. Landscaping projects should plan for falls, French drains or soakaways so paving and lawns shed water.
Winter hardiness
Rated RHS H4 — the UK mainstream, with winter lows near -6°C. The vast majority of garden plants, perennials, shrubs and trees come through a normal winter unprotected; only genuinely tender exotics need a warm corner or cover.
Rain & growing season
One of the drier parts of the country (711mm a year), so established beds still need summer watering and drought-tolerant planting pays off. A typical UK growing season (~328 frost-free days), with the last frosts clearing through spring and first frosts returning in autumn.
Planting Calendar for Hertsmere
Timings are guided by this area's ~328 frost-free days and RHS H4 hardiness; adjust for a cold or sheltered garden.
Conditions by Postcode
| Postcode | Soil | Hardiness | Rainfall |
|---|---|---|---|
| AL2 | loamy-clay with impeded drainage | RHS H4 | 703mm |
| AL4 | free-draining, fertile near-neutral loam | RHS H4 | 703mm |
| WD19 | loamy-clay with impeded drainage | RHS H4 | 723mm |
| WD25 | free-draining acid loam — the classic 'good garden soil' | RHS H4 | 723mm |
| WD7 | free-draining acid loam — the classic 'good garden soil' | RHS H4 | 703mm |
Planning work in Hertsmere?
Browse Companies House-registered landscaping businesses in the area.
