In article , Franz Heymann
writes


It becomes unsuitable when it is processed from plants in the
chrysanthemum family into pyrethrins [esters] for herbicidal or
insecticidal use. In the botanical form, the same plants can have
beneficial uses, e.g. as in the use of Feverfew for aches and pains etc.
I use an infusion of that admirable plant as a nerve tonic and pick-me-
up -- often after a session in urg! :-(

I have not yet seen the answer to the question.
Check your PC, the answer appears on my screen in red lettering.

And what do the words "in the botanical form" mean in the present context?

It means when the plant is alive and growing and thus consists of living
organisms.
--
Alan & Joan Gould - North Lincs.