In earlier papers on this site single plants showed second order polynomial growth, see (double click)
To assure (or reject) these conclusions we proceeded with collecting data sets from others or with own follow up experiments. This page will summarize them and give the results (double click on the summarizing statements, i.e. the titles of the underlaying paper to examen the details).
A home experiment with sage under suboptimal conditions supported second order polynomial growth
All these data show the direction, but, see following paper:
But this observation should not lead too soon to non-linear modelling, see:
The use of linearity and non-linearity in plant growth analysis