Some inner browning is normal, because junipers shed their oldest interior foliage each year, mostly in fall, and it turns brown before it drops. Browning that spreads quickly, shows up in spring or summer, or reaches the outer tips instead of spider mites, heavy shade, drought, or wet roots.

Why do junipers shed foliage from the inside?

Because the oldest foliage sits deepest in the plant, where little light reaches it. Once that shaded foliage no longer adds much food, the juniper lets it die and fall, much as a pine drops its older needles, while the outer green shell keeps growing.

How can normal shedding be told apart from a problem?

By timing and pattern. Normal shedding is fairly even, happens mostly in fall, and leaves the outer tips green, while trouble shows as patchy or spreading browning, speckled foliage, or brown that keeps advancing toward the branch tips.

What causes abnormal browning inside a juniper?

Usually mites, shade, or water problems. Spider mites feed on inner foliage first and leave it speckled and dull, dense outer growth or nearby plants can shade the interior until it dies back, and both long dry spells and constantly soggy soil stress the roots.

Spraying Horticultural Oil Insect Spray deep into the inner foliage, following its label directions, puts the spray on the growth where mites feed.

Frequently Asked Questions

Should the brown inner foliage be cleaned out?

It can be. Shaking the branches or gently raking out the loose brown foliage lets more light and air into the center of the plant.

Does shearing make inner browning worse?

It can. Frequent shearing builds a thick outer shell of growth that shades the interior, while occasional thinning cuts let light back in.

When are spider mites most active on junipers?

In cool weather. The mites that attack junipers are most active in spring and fall, and their damage often shows by early summer.

How should a browning juniper be watered?

Deeply but not often. A thorough soaking during dry spells, with the soil allowed to dry between waterings, suits a juniper better than frequent light watering.