How many harvests would it take to offset the emissions that go into producing a kit? My guess is that this uses more steel per sapling than almost any other method of tending to a vegetable
This system is electricity-based, whereas traditional agriculture is fuel-intensive.
Even fertilizer production is fuel-intensive, and this system avoids using any.
Multiply by the time scale you want the system to last, and you get your emissions savings.
Steel contents is a one-off emissions investment.
Now if you want to compare this system to an other electricity-based, renewable energy only, agriculture, say with electric trucks etc, that'd be interesting.