Time to fruiting for dwarf red shahtoot Mulberry

prashmohan starts with ...
I got this dwarf red shahtoot Mulberry tree 2 years back. The tree has grown into a nice conical shrub. However it does not seem to be fruiting yet. It did set a few fruits - maybe about 20 of them in total all of which dropped before maturity.

Can I do something to help the tree along? The leaves are lush and healthy, so it does not appear to be a deficiency. Is it just a matter of time?

I am in Sydney, Australia.

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