Growing Conditions · England
Horsham Growing Conditions
Soil, hardiness and a planting calendar for Horsham — across 6 postcode districts.
Soil
A heavier, clay-rich soil that holds water through winter and can stay cold and wet into spring. It is fertile and moisture-retentive — good for hungry, thirsty plants and strong summer growth — but rewards raised beds, grit and plenty of organic matter to open it up, and planting is best held back until it dries out. Its winter wetness makes drainage and grading the first question on any lawn, patio or retaining-wall project here.
Winter hardiness
A mild area rated RHS H3 — winters usually bottom out around -4°C. Most hardy plants are safe, and you can grow half-hardy exotics that fail further north, but the occasional hard frost means tender plants still want a sheltered wall or winter fleece.
Rain & growing season
Moderate rainfall (801mm a year) — enough for most gardens without heavy irrigation, though pots and new plantings need watering in summer. A long growing season (~352 frost-free days) — you can sow earlier and harvest later than most of the country, and squeeze in a second late sowing.
Planting Calendar for Horsham
The long season allows a second sowing of quick crops in July.
Timings are guided by this area's ~352 frost-free days and RHS H3 hardiness; adjust for a cold or sheltered garden.
Conditions by Postcode
| Postcode | Soil | Hardiness | Rainfall |
|---|---|---|---|
| BN44 | free-draining alkaline loam | RHS H3 | 801mm |
| BN5 | free-draining acid loam — the classic 'good garden soil' | RHS H3 | 801mm |
| BN6 | heavy, base-rich clay loam that sits wet in winter | RHS H3 | 801mm |
| RH12 | heavy, base-rich clay loam that sits wet in winter | RHS H3 | 801mm |
| RH13 | heavy, base-rich clay loam that sits wet in winter | RHS H3 | 801mm |
| RH17 | loamy-clay with impeded drainage | RHS H3 | 801mm |
Planning work in Horsham?
Browse Companies House-registered landscaping businesses in the area.
