Low balling is the worst thing you can do to yourself, your business and the landscape industry PERIOD!!! If you're low balling you are only hurting yourself. The landscape industry is probably the lowest paid industry that there is compared to plumbing, electrical, HVAC, flooring, construction, etc: don't make it worse! This business has almost no barriers to entry which means anybody in a truck and a few pieces of equipment can call themselves a "landscaper". What will happen is you will end up losing money, rushing through jobs cutting corners and not retaining the customer and getting a referral. If you do retain the customer and get a referral you will end up being stuck in a rut not being profitable and gaining unprofitable business. If you don't know what to charge that's fine, start at whatever price you start at but increase your prices by 10-15% on the next project and so on. I like to operate at a 60% gross margin. For example, you install a new sprinkler valve and it takes you one hour and $35 worth of material. I charge for my labor hour ($40) and the materials ($30). That gives you a total cost of $70. Take 70 and divide it by .4 (70/.4=175). So if my cost is 70 I will charge $175 for replacing the valve. Find numbers that work for you and if they keep working increase the price next time and find what people are willing to pay but stay firm! If you are getting all the jobs you are bidding you are probably not charging enough. This will help you and help the industry as a whole. Don't be in competition to be the cheapest guy in town you'll end up working more and making less.