Let look at the difference from the plants perspective then decide for yourself. Considering this is not going to be an annual clover we are looking at one of the white varieties, so forward we go.
White clovers are slow getting started, first and likely the biggest point to be made. Weed suppression is best performed in crop when we have a full canopy.
Cliff notes: fall planting allows the root system to be established in the fall when weed competition is limited due to temps and length of growing season. In the spring, the fall planted is able to move nutrients and growth into the visible portions of the plant sooner which in turn leads to a quicker canopy. Add in a cover crop of Winter Rye (this is the go to cover crop for clover establishment due to less issues in over population, WR has a natural weed suppression the other cereal grains just don't have while planted at the same rates, and the rye can either be terminated or left alone)
Let's look at spring planted now. The plant first has to establish a root system before working on the viable plant. So establishment is delayed allowing weeds to get more sun to warm the soil creating optimal conditions for weed germination and an early foothold. Running into summer many varieties of white clover can go summer dormant allowing even more of a foothold for weeds.
Yes we can control many broadleaf weeds with mowing and grasses with herbicide, but some just don't have the ability to be present to keep watch and do the work when needed.
Both planting methods will eventually catch up so is one method better than the other? If looking at the end result, no. If looking at other aspects, most certainly! Make your decisions and act accordingly. You can be certain of a couple things: (1) you will have to use weed control with either option but one method allows easier weed control. (2) either way you will end up with a clover crop just one method takes longer to establish a mature crop.
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