If I recall correctly nothing grows under/around a eucalyptus.
If I had the choice among all sorts of possible mulches it would be the last.

The allelopathic effects of eucalyptus vary both by the species of euc and the sensitivity of the plant you are trying to grow. It was my understanding that a lot of the perceived effect is due to chemicals in the leaf litter, root exudate, and general crowding of the soil by the greedy roots.

I'm attaching a link to an interesting article I found that looks at different mulches. Overall I like the look of pine mulch the best in terms of holding its structure (which fits with real world use). The eucalyptus mulch was found to inhibit seed germination but only for a couple of months (see figure 7).

Here is a link that might be useful: Duryea et al., J of Arboriculture 1999

thanks sf_rhino

I was going to try it in a 5.1.1 mix see what happens :) found some the right size and at at fair price.

most euc trees do not have a lot of bark like pine trees so most of the mulch is wood.

only one way to find out I guess make a mix and find out :)

just for the sake of the experiment of course :)

BZ