Hi welcome to GoY, Salix like a moist soil, so if you're planning to keep them in containers, I don't think a coir compost would be a good idea, because it doesn't retain much moisture, and you would have to keep watering the containers regularly to keep it moist, ideally they should be planted in a moist but well drained soil, rather than a container, if you don't have this situation, plant in the soil you have, but make sure that you keep well watered, which will be easier than trying to keep containers of coir compost moist, Derek.

This isn't a coir product according to their website. they talk about coco flakes but say they use the finest Indian coconuts that do not touch the floor. this is their website.

http://www.canna-uk.com/coco_professional_plus

So I haven't used it so don't know how good it is. But if you like the sound of it then go for it. but keep checking on the health of your plants.
they recommend a pot bigger than 5 litres.

welcome to GoY too :o)

Hi Eileen, I was under the impression that any compost made from coconut fibres was coir, sorry, Derek.

so did I Derek. but who are we to contradict them. coir is just the fibres from around the coconut so perhaps they don't use that bit.

Coir is the husk of the coconut, which is normally cleaned off and used for various coir products before the nuts hit the grocers shelves. In its original state, it consists of coarse fibers and soft, fine corky cells. In processing, some is chopped into various grades of fineness to use in soilless potting mixes: coarse for orchids and cacti, and fine for seed starting mixes and bulb forcing--such as Holiday Amaryllis or paperwhite kits. The finer grades are very good at water retention, sometimes even better than sphagnum peat. If I were putting a willow in a pot, I would use one of the coir based mixes available here, called "Waterhold Blend".

Ah, thanks for the info Tug, I've never used it, so as I said, I thought it was coir, you live and learn, Derek.