I Eat Tomatoes
There's no free lunch. A place that provides such an absolutely massive benefit to cultivation must have cost the owner a fortune to make since it allows them to help their successors for years after their death. The group should be super wary right now since they aren't the rightful successors of the owner, and there will be traps here. There's also the karma issue. This can help them break through their bottlenecks, which is essentially raising the limits of their talent. There's got to be a huge karmic price they'll need to pay in the future to the owner for such massive benefits.