If you do both, definitely aerate first. The slice seeder will place
the grass seed just below the surface, where it needs to be. The
aerator would then just dislocate a lot of it.
How much a lawn benefits from aeration depends on the soil/turf
condition If it's compacted soil or has excessive thatch, where
water has a hard time penetrating, aeration can be a big benefit. In
general, if it hasn't been done in many years and you're renovating,
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