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♫♥●••·˙က်မစာေရးသူသည္... ျဖစ္ရပ္မွန္၊ စိတ္ကူးယဥ္၊ မွ်ေ၀ခံစားမႈ မ်ားႏွင့္... ေကာင္းကင္ၾကယ္အေၾကာင္းမ်ားလည္း ေရးပါတယ္ရွင္..˙·••●♥♫

♫♥●••·˙My story telling is reshaped by your attentive imagination˙·••●♥♫

April 6, 2016

When inner conifer needles turn yellow or brown

Filed under: personal - for my garden — အိမ့္ခ်မ္းေျမ့ @ 3:37 pm

DON’T PANIC: Nothing’s wrong, and they’re not all dying in unison, I promise. Though we commonly call them “evergreens,” conifers such as pine, arborvitae, spruce and Hinoki cypress (above) lighten their load of old needles in late summer and fall, with a show of yellowing or browning that can scare a gardener at first.This phenomenon should not be confused with browning at the tips or overall yellowing or browning that can happen at other times—such as from winter desiccation; from the effects of roadside salts; from pests and diseases (including diplodia tip blight in some pines or phomopsis in spruce and non-resistant junipers); or from drought. (See what road-salt damage and winterburn look like by comparison in these photos.)

The browning I noticed in late July on my Eastern red cedar in the front yard (Juniperus virginiana) is suddenly showing up as gold or rusty-brown or a progression from one to the other on many other conifer species. The Eastern white pines (Pinus strobus), above, with their long needles, are always the most dramatic, turning what looks like mostly gold. Hard to believe the plant will be OK.

But in fact needle-drop is a normal part of the life cycle, though the rate varies by species, and can also accelerate if environmental stresses like dry conditions or pest infestation have affected the tree or shrubs in a given season.

Before you call the arborist in, though, go inspect: Look at a branch closely (such as in the Thuja occidentalis, above), to identify where along it the fading foliage is. I found the illustration below on a Michigan State University Extension factsheet, showing the natural aging and shedding cycle (again, it varies by species how long till leaves are shed).

The losses should generally be from the inside out, not at the branch tips. Inner needles are the oldest, and as they age and get shaded by new growth farther out, they photosynthesize less effectively and are eventually shed. The plant lightens its load, and good thing, since snow and ice may be coming and extra needles could hold too much weight for the longer branches to bear.

All conifers do this, just in varying degrees (that’s a Thuja plicata just above), and at various speeds from every couple of years to every five or longer. In fact some, such as metasequoia and bald cypress and larch, do it thoroughly every year–the so-called deciduous conifers. But that’s another story.

Speaking of evergreens: Some broadleaf ones such as Rhododendron will be pushing off old, useless foliage now, too. The only thing I’m worrying about there: the big old leathery foliage is falling into the frogpond and making the tenants angry. As the official janitor, my workload is temporarily increased, but if I don’t keep up I could have an amphibian riot on my hands.

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က်မစာေလးေတြကို အခ်ိန္ေပးလာေရာက္ဖတ္ရႈေသာ သူမ်ားအားလုံးကို ေက်းဇူးတင္ပါတယ္...လို႔ ေျပာၾကားလိုပါတယ္ရွင္။

♫ ♥●••·˙My story telling is reshaped by your attentive imagination˙·••●♥♫
သည္စာမ်က္နွာေပၚတြင္ရွိေသာ ... ဖန္တီးထားေသာ စာေပ၊ ေဆာင္းပါး စေသာ အနုပညာနွင္႕ ပတ္သက္ေသာစာမ်ား၊ က်မကိုယ္တိုင္ဆြဲေသာ မေတာက္တေခါက္ပန္းခ်ီမ်ား၊ ဓာတ္ပုံမ်ားကို အျခားေနရာတြင္ ကူးယူေဖာ္ျပသည္႔အခါတြင္ အိမ့္ခ်မ္းေျမ့အမည္ႏွင့္ ဆိုက္အမည္ကို "ျမင္သာထင္ရွားေသာေနရာတြင္" ေဖာ္ျပေပးပါရန္ ေလးစားစြာျဖင္႕ ေတာင္းပန္အပ္ပါသည္ရွင္။

♥♥ ...... ♥♥

တစ္ခ်ိန္တုန္းက အမွတ္တယေလးေတြ....

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♥♥ ...... ♥♥

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