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I also picked up 8, 50 pound bags of a Pellitized, Gypsum and Lime combo for one property in Needham. The front lawn is a tuff one, as it is on a ledge and a hill which causes the lawn to heat up during the summer hot season and it also dries out quickly, because it is on a slope. the back lawn is almost all in the shade under pine trees, so it is a bit acidic.
I used the combination before at one home in Medfield quite a few years ago and the results were just unbelievable. The lawn went from yellowish and lifeless to a deep green and then over time became very healthy and a vigorous grower. what a change, hopefully this application will have the same effect. It's late in the year so we may not see any improvement until next season.