Hi Jill. Package directions usually assume two things: 1) Not all seeds will root and take; and 2) You are germinating before planting. If you just want to plant without germinating, then I'd recommend the 12 inches since they can get a bit bushy. However, you may risk some gaps in your garden until they fully develop out. Or you can always just plant more seeds, and try it again, in the areas where the seeds don't end up rooting.
Hi Jill. Package directions usually assume two things: 1) Not all seeds will root and take; and 2) You are germinating before planting. If you just want to plant without germinating, then I'd recommend the 12 inches since they can get a bit bushy. However, you may risk some gaps in your garden until they fully develop out. Or you can always just plant more seeds, and try it again, in the areas where the seeds don't end up rooting.