Using Gypsum to Improve Clay and Compacted Soil

Using Gypsum to Improve Clay and Compacted Soil

Clay or hard subsoil causes poor drainage, soggy conditions, and compaction. Gypsum (hydrous calcium sulfate) slowly loosens soil structure over a 3-year program—not a miracle, but effective and affordable.

How Gypsum Works

Penetrates clay particles, creating air and moisture channels that break up dense structure. Does not affect pH (safe for acid-lovers like azaleas). Contains calcium and sulfur but no major N-P-K—continue regular fertilizing and organic matter addition.

Application

Spread granular gypsum at 40 lbs/1,000 sq ft with a lawn spreader. Any season, once yearly. Water in to activate. Safe for people, pets, plants—no burn risk.

When to Use

• New gardens: combine with organic humus (manure, compost, peat).
• Established gardens: surface application avoids disruptive tilling.
• Compacted areas: from machinery, livestock, or salinity damage.

Gypsum reconditions soil without major renovation—spread, water, wait. A long-term fix for heavy soils.