Should you charge for the removal of yard waste? Absolutely. It is a cost of doing business and should be accounted for and charged for like other expenses - gas, labor, materials, etc.

How you account for it is upto you. If you charge an hourly rate for maintenance, then it should be factored into that rate. If it is on a by project basis, then make sure the cost of a dump/recycling run is included in that project's fee.

IME, maintenance gardeners/contractors are not very inclined to raise their rates.....maybe because they fear competition may be undercutting them. But with the increase in gas prices and associated odd costs - like recycling/dump fees - that are often overlooked, it is a very natural and expected thing to do. You might just want to include a note with your billing statements explaining what the increase is for....consumers generally understand these things :-) Prices increase all over the place for all sorts of goods and services. No reason you should be shorting yourself by having to pay higher prices that are not offset by increased rates.

Put it in your hourly rate (say $2 per hour) or charge by the clear bag, or dump trip.