the streptacarpus, does it prefer peat or lime?

Ordinary potting compost is fine - they don't have a special requirement for either.

thank you, so whether it's alkali or acid it doesn't matter? i'm asking for a friend.

Most potting compost is neutral - except for ericaceous, which is acid - I assume your friend is in Britain and will be growing it in pots? And its not a case of either acid or alkaline (lime), there is a third option - neutral ph.

oh ok thanks yes he is in uk, he say's the plant keeps wilting.

Under or overwatering? Cold draught from the window? cold windowsill overnight?

ok i'll let him know, thanx for that.

As long as he doesn't use a loam based compost.....a no-no for streps....

I would check also that there are no vine weevil larvae present in the compost.I lost half a dozen plants last year - the larvae eat the roots and this can cause wilting.