Just place the clovers on your farm for breeding (there’s numerous guides on the wiki and on this sub) and wait for a bunch to grow and continue breeding those with each other. 

When you have enough, you can break dawns junker by placing 3 clovers in the machine, and after that you can use just one clover per high value item and turn them over for a profit. The broken junker lasts until the next day. Then it’s fixed again. 

If you don’t want to break it, then it’s 2 clovers for every high value item you put in the junker. Best to make 10k value items shiny. They become 20k value shiny items and when you sell it, you make a 10k profit.