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I do most customer com via email and was planning a fall tree work special to my past clients, free soil samples for any booking, do you think it's prudent?
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What's a free soil sample? Are you giving a little box of dirt to each customer?
In the likely case that you mean a free soil analysis, you'd be better off building racing cars out of dog sh*t to hand your customer's kids. As a promotion, it is lunatic and insane, and they will probably hate you for it . . . but that is a hell of a lot easier to deal with than having to hate yourself if you make that ridiculous offer. After five people take you up on it, you'll wish you were in a box of dirt.
Save the soil analysis for the real work of high-end PHC, and only when you really need it. I can make four hundred dollars doing quality pruning in less time than it takes to make sixty bucks profit on a soil analysis. If you really need a promotion, offer them 5% - 10% off something. You'll be sorry you did, but you can live with that.