Gardening
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Only gardeners can garden, for it is hard, if not to impossible to do if you don't have proper training. Estonia is well known for gardening - it results in really big and unspoilt wood coverage.
Gardeners pass their knowladge on to their students, who immediately acquire dark powers. When gardeners are at age 25, they start to root. For that, they must stay paralyzed, not moving a single muscle of their body at least for 7 days in row. If they succeed, they can now start to acquire water from ground, which allows them to survive. Without the water they would surely die, for they are no longer completely humans - they are slowly mutating into gardens.
This progress is really long (for big trees, almost 20 years) and gruesome, for the gardener is not feed once. If whole progress is successful, one can start to grow seeds.