Why do some evergreen trees turn a yellow colour ?

Answer 1

They may be dieing, or it may be natural, there are some that have a natural yellow color, what type is it?

Quote:
If the yellowish one thrived for four years with no other odd signals & no browning, then the color may well be natural. New growth on some Taxus cultivars, including occasionally Tauntonii, can be yellow-green; in their third year their previous needle growth can turn yellow & shed, with the replacement needles quite pale -- though if not a naturally yellow variety
the yellowishness should darken later in the year. If you actually have "Viridis" which stays pretty short, that one's VERY yellow or
yellow-green. "Sunburst" can be startlingly gold at least part of each year. The more upright "Standishi" is very golden. I don't know what other varieties might be yellow. Some of them, if they are put in shadier areas they get greener, in sunnier places they hold the yellow. If yours is healthy except for your impression of the color, it's probably not to worry over, though I wouldn't swear to that. More often one hears people griping that they bought a yellow evergreen for the usual color & it turned an ordinary green on them.

If yours is really supposed to be dark green then there's a rule of thumb I've been told can usually be counted on to assess health: When evergreens turn yellow along the limbs from the trunk outward, this is old needle growth being replaced by young. If the green fades to yellow at branch tips first then works its way inward, that is a sign of disease. This isn't for sure the case on yews or junipers types can be naturally golden, but for evergreens that really should be green, that rule of
yellow-from-inside-out good, yellow-from-outside-in bad, is if not
definitive, at least an indicator that a problem of insects stress or
disease should be thorougly checked.

Answer 2

The needles on evergreens turn yellow and die. They are replaced by new needles that grow to the outside each year. Some needles last 1 some 2 years so there is usually a buffer of green needles on the end and the yellow old ones to the inside. If the entire tree is turning yellow it is under stress and is not long for this life. It may also be putting out a heavy cone crop. That is common when trees are stressed.

Answer 3

There is one conifer, called a Tamarack or Hackmatack, that is actually deciduous - so it can't technically be called an evergreen. In late fall its needles turn yellow and then drop. It produces new growth in spring. My friends have one in their yard, covered with Christmas ornaments. They are invisible in the summer, but about now the tree is getting ready to drop its needles and all the ornaments will be visible on the "skeleton." Quite a device!

Answer 4

If the evergreen trees turn completely yellow, they are more than likely Tamaracs, they are conifers that shed their foliage every year. Quite beautiful, actually!

Answer 5

1

Answer 6

Some speicies turn yellow at the tips. If it's all yellow, try researching online, water it more, or add fertilizer.

Good Luck!

Answer 7

could be too much or too little water

might be lacking in trace elements e.g. gardenias turn yellow when lacking magnesium. Try sprinkling some trace elements around them and see if they pick up

Answer 8

could be dying may need more water or it might be red spiders

Answer 9

a lack of nitrogen and or acid.

Answer 10

It's dying.