From the CO2Science Archive: You might get the impression that we are pining for warm weather from all the garden plants we look at in this series. And you would be correct. Including that this week we look at Cucurbita pepo L. or Summer Squash, which frankly needs no help from CO2 to grow enormous and take over the entire garden. But just in case you want it even bigger, in 1991 there was an experiment in which squash was given an extra 600 ppm CO2 and it grew 83% larger. The archive only records one such experiment, probably because the giant squash ate the scientists.