Arabian jasmine or jasmine sambac is locally called motia. It blooms almost all year except in winter months. Here are some tips to make it bloom more and bigger.
1- Give it moisture and water. In summer heat of lahore, this plant will drink all the water you will give it. specially those plants which are in container. Keep it moist. this can be achieved through wet trays of pebbles or misting leaves in the evening. Water in the evening instead of morning.
2- Digging and hoeing: This is what we locally call 'godi'. Do this almost every weekend or atleast every month. Purpose is to move soil beneath the surface to come up and absorb sunlight while surface soil to go beneath.
3- Protect from afternoon sun - let it give full sunlight but protect from blazing afternoon sun
4- Give it acid-loving ferilizer high in phosphorus . you can also give it water soluble/liquid fertilizer for blooming. in monsoon when temperatures drop, you can give well rotted cow manure which will promote plant's health. i usually prefer leaf mold in hot summer months. then in late summer cow manure. Also try epsom salt, it works wonders for most shrubs specially jasmine.
5- Prune it in winter. growth will be vigorous and blooms will be bigger on new growth
one more important thing. Buy indian motia instead of pakistani motia. indian one has leaves more darker and roundish than pakistani motia. it is also called labenese motia. i will also post pics differentiating the two. Another form slightly variate is called bela.