[Huckleberry]

Our clover is currently about a foot tall or maybe a little longer, when is the best times to mow it without hurting it but still allowing it to choke out the rest of the undergrowth?

 

[Maconplc]

The reason to mow clover is for weed control, and to keep fresh growth on your clover. That looks like a really clean stand so weed control is not an issue right now. I wouldn't be against mowing it to stimulate new growth right now, but it also would not be bad if you wait another couple weeks. Do whichever fits your schedule best. I would plan to mow again in early September to stimulate new growth before hunting season.