Mycorrhiza und Cocos ?

Yes, highly advisable...........mycorrhizae are the "wonder ingredient" in my opinion.........the benefits are real. They reduce the amount of fertilizer required and boost growth and health in my experiences over the last 8-9 years and there is no way I would ever grow without their addition...........even vegetables like tomatoes and cucumbers will show improvements in productivity. How much to use depends on the product, but of course evey product comes with instuctions on use. Mycorrhizae need to come into contact with the plants' roots, so putting some in the planting hole is the easiest method of application. Some products can be dissolved and watered in, others need to be planted........it all depends on which product you purchase.