It produced lots of new red leaves this year but over the summer a lot of them have turned brown and dropped off. Is that on all of the branches or just the ones that you pruned? I am pretty confident it has not dried out and I feed it as prescribed. The Flower Buds On My Pieris Japonica Have All Turned Brown Over Winter. Soil can be made more acidic by mulching with sphagnum peat, applying aluminum sulfate or using an acidifying fertilizer. As you can see from the photos the new leaf growth is yellow (from the original beautiful scarlet) and over the last two weeks the leaves have started to brown from the tips. Over the past couple of days, most of the new red leaves on my pieris have suddenly turned brown and limp. In a corner of the west facing end of a small garden (terrraced house). What could be happening? Listed below are some of the most common causes for leaves falling off. Neither of these conditions produce the white liquid that you describe. I have a 8 year old pieris (not sure which flavour) which has been very happy with me until this year. On plant Pieris … Haven't had any fowers. Please help! Are the older leaves falling off of the plants? Fluctuations in temperature, light, and moisture can have an adverse effect on plants, especially as they a Hello! It is not white fluid, but it is copious. If your Pieris japonica is located in full sun, or if it is planted in soggy soil, you may need to move the plant to a better location. There is a scale insect that produces a lot of sticky fluid that gets on the leaves and stems. They were growing beautifully, and all of a sudden the leaves started turning brown and falling off on one plant. Could it be the heat/sun? It's planted right next to the decking in partial shade. Shock – Shock from transplanting, repotting or dividing, is probably the number one reason for leaf loss in plants. Leaves that turn yellow between the veins may be a sign of alkaline soil. This can also be true of plants going from an indoor environment to an outdoor one and vice versa. They hatch in mid-March begin to feed on the underside of the leaves–sucking the juice from the leaves. I have 5 beautiful Japanese pieris mountain fires. I wasn't worried until the others seemed to be doing the same thing- one after another. The Lower Leaves On My Pieris Shrub Are Turning Yellow And Dropping Off ? - The plant gets morning shade and afternoon sun; Q. Pieris - Some of the leaves on the bush are yellow and fall off when touched gently. We are now in the ... Q. Japanese pieris is very susceptible to infestation by the lacebug, especially when the shrub is growing in full sun. - What is causing them to dry up before opening in the spring? It's only the new growth that's affected. My Pieris japonica 'Mountain Fire' has gone from a healthy green and red to a distinct yellow (on the outer leaves--the ones on the inside of the shrub are still green). It's getting regular water through sprinklers, is in full sun, and has had no supplemental fertilizer (just compost in the hole when I planted it in April-ish). Lacebugs have piercing, sucking mouthparts. Two other pieris that I have still have all of their bright red leaves. The lacebugs overwinter on the leaves of the shrub, its eggs are embedded in the leaf tissue. Some of the leaves are still red, and a couple of days ago these new growths were all bright red.