I promised the second "method"...well, here it is:
(I don't usually make wire trees, not because I don't believe in them, but rather because they are time consuming compared to this method.)
Choose a twig that will be your tree's "main body" like this one
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This crude skeleton obviously needs refining, i.e. more and finer ramifications (from branches into twigs).
I do this with steel wool, but rubberized horsehair o.s. do the trick as well. (I just happened to have steel wool ready at hand when I made my first attempt
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You might find wire loops under the steel wool if you look closely. This was necessary as the fine steel wool would be drooping. This convinced me that coarser steel wool is better suited for "non-drooping" canopies (and I reserved the finer grade for drooping branches (birch, willow, etc).
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I fix the steel wool with general purpose 1-component glue like UHU o.s. It does not matter too much if the leaves are going to cover most of the area. If the tree has a thinner leaf-canopy, you must be more careful.
The steel wool can easily be cut to shape with scissors.
I usually spray the whole canopy zone with a dark brown/grey colour (on both sides), with a darker version on the underside. For this the colour should be waterproof!
Once this is dry, you cover the steel wool with "foliage" (as per my first method). Let me stress that I personally do not spray-glue the whole canopy and drop a mass of scatter foliage on top, but rather use white glue on small areas at once and proceed, but this is up to everybody.
And here you are:
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Try it you'll like it
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Hope this is inspiring..!!
Questions and comments welcome as usual!
Cheers
Romain