Using Old Bagged Lime: Still Effective?

A homeowner had a several-year-old bag of powdered lime and asked if it's still usable and at what rate.

Viability

Lime doesn't expire, but it can cake. Break up clumps; it's still calcium carbonate.

Application Rate

• 40 lbs per 1,000 sq ft raises pH ~0.5 units.
• If unsure of need, spread thinly over 5,000 sq ft for negligible impact.

Best Practice

Test soil pH first. Only apply lime if pH is below target (6.5 for most lawns/gardens).