"At the same time, I should think it might be possible; only we should have to remember the names of the plants more or less exactly symbolizing those qualities and defects.

In short, what you need is a sort of language of flowers as applied to the catechism.

Let us try.
"For pride we have the pumpkin, which was worshipped of old as a divinity in Sicyon.

It bears indifferently the character of pride or of fertility; of fertility by reason of its multitude of seeds and its rapid growth, of which the monk Walafrid Strabo wrote in noble hexameters a whole chapter of his poem; and of pride by reason of its huge hollow head and its bulk; and then we also have the cedar, which Peter of Capua and Saint Melito agree in accusing of pride.
"Avarice?
I confess I know of no plant which represents it; we will come back to that." "I beg your pardon," said the Abbe Gevresin; "Saint Eucher and Raban Maur speak of thorns as emblematical of riches which accumulate to the detriment of the soul; and Saint Melito says that the sycamore means greed of money." "The poor sycamore!" cried the younger priest.

"It has been served with every sauce! Raban Maur and the Anonymous monk of Clairvaux also call it a misbelieving Jew; Peter of Capua compares it to the Cross; Saint Eucher calls it wisdom, and there are other meanings.