Looks like it is in need of nitrogen. Give the soil some composted manure around the root line of the plant. Unfortunately that means removing your marigolds. Actually, just compost them right into the soil with the manure, they will aid your juniper as well. And the soil looks incredibly dry, add some leaf mulch to the soil to increase the water holding capacity.
Of course, don't forget to water and deep water your tree which means putting the sprinkler or soaker hose on for at least an hour.
Also, if you plant some crimson clover around the tree (instead of marigolds or other flowers) it will look really nice and your can trim it down for some green manure for your Juniper and Nitrogen fixing bacteria will assoiciate with nodules on the clovers roots which the plants will give to your tree when you cut them back. And have this green manure will reduce your need for watering because it will shade your soil.