Ok so I recently completed a small planting job for a clients backyard, and she was very satisfied at the end of the day and payed the bill in full. A few days later, I get a call saying that she wants me to replace a few of the transplanted sedums and an astible that looked wilted. Does this happen alot? Is it my fault for not specifying in the contract that I would not guarantee the plants? I know the owner of the nursery and it won't be a problem to replace the plants but it is still a few hours of wasted work with the travel.