For most standard growing setups — vegetable gardens, seasonal row crops, general weed suppression around planted beds — 100 GSM is usually the right call without overthinking it. It's meaningfully more durable than our lightest 75 GSM option, holding up across at least a full season or two of use, while avoiding the extra cost of the 120 GSM tier that's really built for permanent plantings and heavy foot traffic.
If you're unsure which weight to choose, this is the practical default: durable enough for genuine multi-season use in a standard growing setup, without over-specifying for a level of durability a typical vegetable garden or row crop doesn't need.