Two possibilities:

[1] Eleagnus pungens [small suckering tree/shrub, with silver leaves and highly aromatic flowers now]

[2] Lonicera caerulea [goji berry/Duke of Argyll's teaplant/Wolfberry] has small starry pink flowers. Might produce edible red berries in autumn.

In both cases you will have to take the main stem right back to the ground and kill off with strong weedkiller. Alternatively, shape it to you taste and keep it.