Hampshire and Dorset sit over an extraordinarily varied geology — chalk, clay, greensand, gravel terraces and river alluvium all create very different soil conditions within a relatively small geographic area. Understanding your soil type is the foundation of successful gardening and landscaping.
Chalk Soils (North Hampshire, Wiltshire Downs)
Chalk soils are thin, alkaline and free-draining. They warm up quickly in spring and dry out rapidly in summer. They suit a wide range of ornamental plants but need regular organic matter addition to improve moisture retention.
- pH typically 7.5–8.5 — alkaline
- Fast-draining — drought risk in summer
- Plants that thrive: lavender, salvia, achillea, sedum, clematis
- Avoid: acid-loving plants (rhododendrons, camellias)
- Improve with: annual applications of organic matter
Clay Soils (Test Valley, Dorset Vales)
Clay soils are heavy, moisture-retentive and nutrient-rich. They are cold and slow to warm in spring, prone to waterlogging and can crack badly in drought. Improve with grit and organic matter, and consider drainage in lower-lying areas.
Sandy and Gravel Soils (Southampton, Bournemouth)
Sandy and gravel soils — common around Southampton and the Hampshire coast — are fast-draining, low-nutrient and prone to drought. They need regular organic matter addition and mulching to retain moisture and nutrients. They warm up quickly and are easy to work.
A&T Landscapes understands Hampshire and Dorset soils and can advise on the right approach for your garden. Call 07735 916029 for expert local knowledge.