sentence: the most common dacha fruits in cool temperate regions of russia are apple , blackcurrant , redcurrant , gooseberry , raspberry and strawberry ( sometimes also sour cherry , downy cherry , plum , pear , sea-buckthorn , actinidia kolomikta , black chokeberry , serviceberry , sweetberry honeysuckle , blackberry and grape , but many of them are either rare or not hardy enough and require winter protection ) .