Yes, whatever you do, don’t dead head it straight away.. I have one that’s coming up to three years old, that’s still twigs thanks to my other half’s excessive trimming!!
Evergreen feed and weed is good for lawns. You can get granules that you use with a spreader, or miracle grow do soluble lawn feed and you just attach a special gun to your hosepipe and put the powder in there - so quick and easy. Keep your grass cut regularly and don’t worry too much about the patches - we have some in ours from animals peeing

so some stuff you just can’t help