Looking for a low bush which will do good on hot conditions

[eez0]

Let's assume 4ft tall, what do you think would work?

Last year I tried hot-tolerant blueberries, but they didn't work.

[Daintree]

 Cocoplum!

[Dimitry Fisher]

You mean - for Canary Islands climate, right?  Dry hot summer?  Then probably Prosopis species, Ziziphus species,  Capparis spinosa, pomegranate (if you can keep it small).  San Diego has similar climate, except the winter here is somewhat cooler.  Psidium cattleianum or eugeniaefolium does fine here. Eugenia uniflora  does fine.  Guavas do fine but good luck keeping the tree under 4 ft   Pineapple guava (Acca sp.) does fine. Dovyalis caffra, hebecarpa , and hybrids do very well here; but again they tend to be larger than 4 ft.  Mine got 8 ft tall in 4 years. Another thought is that you may grow plants in pots, this limits their growth to a manageable size.  You won't get lots of fruit this way though.   

[Galatians522]

Dwarf natal plum

[eez0]

well, I ended up with another stone ruby guava

[gnappi]

Grumichama cherry?

[MadFarm]

Suriname cherry, cocoplum

Where in Los Canarios are you?