" ... Cho et al. (2020) ... studied the response of two Phalaenopsis (orchid) cultivars (Queen Beer Mantefon and Queen Beer Jupiter) to elevated CO2 and nutrient supply over a period of 21 weeks.
... twenty-month-old plants were grown in pots under ambient (~400 ppm) or elevated (~650 ppm) CO2 levels (elevated CO2 was only administered for six hours per day between 2200 and 0400 hours).
... elevated CO2
significantly improved net photosynthesis, increasing it by 30% (EC
1.0) and 80% (EC 2.0) in cv Mantefon and by a whopping 270% (EC 1.0) and
242% (EC 2.0) in cv Jupiter.
Elevated CO2 also had a positive impact on plant water use efficiency, enhancing this key parameter from 103% to 187% depending on cultivar and nutrient (electrical conductivity) supply.
... production of more flower buds and lateral branches and an increase in flower spike length in the elevated CO2 and high nutrient (EC 2.0) treatment,
... they concluded elevated CO2 will "improve flowering quality if nutrients [are] sufficiently supplied and optimized for Phalaenopsis cultivation."