The treeballs are bigger than their ancestors and almost lost their sticking ability, but that wasn't even the biggest change. That was the internal "skeleton", a fine network of hard material which will remain after the plant itself dies. Now the treeballs can grow on top of each other unlike, their ancestors, and thus can compete with other plants in the forests. Soil will be blown into the fine network, letting the treeballs have all nutrients they need for growth. Over time, these structures will grow huge and become more reminiscent of a coral reef than a tree.