The Three Tenors

I put three tall, narrow boxwoods in the shade below the aspens, near my potting bench. They are buxus 'Green Tower' and were all bought from the same nursery.

The Three Tenors, I called them. Identical, same size, same cultivar, same planting conditions side by side. My intent was to have a cohesive group of three to serve as a backdrop in this corner against a garage wall and to screen the potting bench work area. 

That was the plan. Do these three boxwoods look identical? They do not.

They are not a harmonizing group of tenors after all, they're more like Goldilocks bears -- one dark and solidly big, one medium and sending flexible new branches out, and one small and askew with new, light colored growth.

The one on the right is the smallest but is full of new light green growth and open branches going everywhere. Its top is flopping over.

Next to it is a big, dark green tower of foliage. It has had no new growth since it was planted a couple years ago, not a single new leaf. It just sits there, brooding about being in the corner, remaining a dark color and a compact shape, holding all the leaves it had when planted, losing none, growing none.

The leftmost of the three is the one that is in-between. Still a darker color, but reaching out with new growth. Not as wild as the littler one, but definitely growing and flopping about a bit.

Unfortunately this last one has a psyllid insect feeding on it. The nymphs cause leaves to curl up tightly as they suck the sap from new leaves. The cupping is distinctive and this boxwood has it.

It is common and it won't kill the shrub. It can be left alone if the infestation is not too severe. Or I can snip off the cupped leaves to eliminate most of it. Or spray horticultural soap in early spring to coat the nymphs.

I am more worried about the big solid boxwood in the center that has had no new growth ever. It's green, there is no browning or lost leaves . . .  but it simply isn't doing anything. 

What to do with three boxwoods that won't harmonize, seem to have a bug going around, and won't make a nice trio of shapes and colors? I'm at a loss.