New Yew
I have 500 or so Yew trees 60 to 70cm tall in 2-3ltr pots I'd say they we're pot bound loads of roots showing, some have gone a more golden colour (not good).
I want to transplant these trees into 5ltr pots and keep for at least a year before planting into the ground to make a hedge.
My questions are what soil do I use and should I mix a Horticultural grade lime-free washed course grit in with the soil and maybe a few handfuls and the bottom of the pot to assist in drainage?
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The golden colour is a sign of being pot bound and a good feed seveal time should restore the verdant green colour. As per Verdun, why do you have them in pots?