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Create Tree Farm - Reset
Detector shuts off after the tree breaks and the machine is reset
Create Tree Farm - Underground
Here is the "wiring". Note the two blocks distance to deal with quasi-connectivity (this is a vanilla bug that is also a feature)
Create Tree Farm
This farm uses the Redstone Dirt Detector to trigger the gearshift and makes use of the Redstone Dirt Blocks underground to carry the signal
Super Simple Create Tree Farm
Using just the Powered Redstone Block and a repeater. Because it is strongly powered, you can detect when the tree grows and trigger the gearshift
Botania Tree Farm - Underground
Redstone Dirt blocks as "wiring", triggers pulse mana spreader with a Bore Warp lens to chop the tree
Botania Tree Farm - Timer
Redstone Dirt block carries signal from the Hovering Hourglass into the redstone torch once per minute to pickup saplings and place them near the rannuncarpus
Botania Tree Farm
Rannuncarpus on a Redstone Dirt Detector block puts saplings on the other detector