How can I get my neighbors lawn to grow realy lang but not to thick? Please help me.....?

I make $20.00 every time I mow their lawn and it dosent grow very much.. Is there some sort of product.. That makes it grow long and thin?.. Thanks

Answers:
Tell them they don't have a healthy lawn, then get some good fertilizer.

Other answers:
LOL! Gotta love capitalism. Offer to fertilize it!
LOL! Gotta love capitalism. Offer to fertilize it!
water it...fertilize it ...then u trim it
Elenor is right, offer to fertilize it and make sure you water it also, don't forget to charge him for fertilizing it.
You could put down some fertilizer,except when it rains you wouold be mowing 2 x per week or more. Good luck. Remember to use the recomenned rate.
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