Hi,
To improve sandy soil:
1. Work in 3 to 4 inches of organic matter such as well-rotted manure or finished compost.
2.Mulch around your plants with leaves, wood chips, bark, hay or straw. Mulch retains moisture and cools the soil.
3. Add at least 2 inches of organic matter each year.
4. Grow cover crops or green manures.
Regards
Ashwini S
