This topic seems to have been exhausted from an Abhidhamma perspective, so this topic will be closed.
If anyone has further information specifically from the Abhidhamma Pitaka or its commentaries that relates to the topic at hand, then please advise a Moderator or Administrator and we will happily re-open the topic for you.
Feel free also to open a non-Abhidhamma specific topic if you wish to discuss the general matter of plant-life and sentience further.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine