Anyone can give suggestions as to why these conifer trees are yellowing on some of the needles?

Question

these are Tsuga Canadensis or Canadian Hemlock trees which were planted a year and a half ago.

some are looking very good and green whereas others are yellowing a bit. Have kept them watered well but have had extremely dry summer last year and this year. have used ironite and fertilized them.

dont think they are really holding any water, except mabye two which have died. the others I am not sure about, but was wishing someone to give some advice or suggestion regarding this.

Thanks for your answers!

Answer 1

I would try spraying the leaves with water, not the roots,

Good luck.

Answer 2

Yellowing can be a sign that the plants' roots are not in well drained soil. Can also be a sign of higher than normal ph levels (conifers are acid-loving plants - low ph), but without testing thats all I can suggest.

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Answer 3

The soil is probably holding too much water.  Your best bet is to get your hands into that soil!  Dig around the root ball, 2 or 3 inches deep, and see if that soil is staying moist.

If it is staying soggy, you know you have to find a way to back off on irrigation or improve the drainage.  No amount of fertilizer or iron can correct the soil.

(quick re-post, looking at your lush green lawn is an even bigger indicator that those trees are probably getting to much water)

Another problem might be that the soil is dry, which Canadian Hemlocks love until you add iron or fertilizers.  Chemical applied to a dry plant can be toxic.  You have to water a plant well, give it a little time to take in the moisture and then fertilize.