Thank you for your question. Western chokecherry is a native shrub so it will do well in the Colorado landscape. It does have irregular branching and will sucker to form a multi-plant thicket. These three are planted quite close together in a relatively small space not leaving much room for expansion. You can certainly remove the suckers but keep in mind that suckering is part of the growth habit of this plant. If you removed rock to form this planting space did you also remove any landscape fabric that may have been under the rock? if not, it would be good to move the mulch aside and remove the landscape fabric then replace the mulch. Be sure your drip lines are functioning correctly, keeping the area moist but not too wet and you may want to slowly expand the circle of drip line outward to encourage better root development. Check the moisture level by digging down a bit or using a screwdriver or rod to ensure that water is evenly distributed and is saturating the soil. Once established the shrubs will require less water as they are quite drought resistant but you should give water this fall and through the winter to help in dry weather. 

It can take a while for a shrub to recover from the transplant shock that occurs when put into the landscape. We have had some hot temperatures and this can add to stress levels especially if these are getting full sun and moisture levels are not adequate to compensate for the heat. Branches can be damaged or bruised when transplanting and may eventually die so you can prune them if you want.  Signs of stress like wilted leaves may occur but it is good to look at the underside of the leaves and branches to make sure there are no insects like aphids that could be injuring the leaves. Watch for new growth on the branches, keep the area evenly moist but not too wet and give the shrubs some time to recover from transplanting. 

If you continue to see a decline in your shrubs please email with new pictures that are a close up of healthy and problem areas and any observations you have had regarding insect activity, moisture levels and other conditions.