For anyone who hasn't heard about this stuff, it's a product made from chopped straw, partially composted, and “mineralised”, which came into popularity a few years back, as a mulch material.
This is one of the promotional pictures, from their website:
They do state that it darkens, over time.
Normally, if I want to add nutrients, I would use our own home-made compost as a mulch, although you always have to be aware, when using home-made compost, that it may well contain weed seeds. Here's a wall-mounted Strawberry Box, mulched with lovely rich home-made compost: here it is, after the owners were away for a couple of weeks, and not there to notice the weeds...
Yikes! Tomatoes!! (And this, dear reader, is why I always advise Clients not to put kitchen waste into their domestic compost pens...)
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