as per some plant doctors at Texas A&M: 1. Yes, higher ranges of CO2 appear to be beneficial. Initially. 2. The effects are transient, so forget it. The plants will return to normal rates of growth, because like all living things, they compensate to their environment. This is very much akin to a drug addict who intially experiences a high, but will soon require the same rates of drug to resume normal operation. If you stop giving your plants those high levels of CO2, they will probably go into withdrawl symptoms until they aclimate.
Steve Topletz
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