From my perspective, there are two key variables that must be taken into account when deciding how to establish a perennial clover plot. Is the soil bare and exposed, due to being tilled or following up a brassica plot from the prior year? Also, how late in the season is it where you're planting? If it's early in the year and you have a relatively bare soil surface to work with, frost-seeded clover is an option. If the soil needs some attention, and/or it's too late in the year for frost-seeding, plant buckwheat around 5/15 and establish the clover in a fall mix. It's just easier to be successful using that approach.
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