In the northern hemisphere, the rings of a tree are always farther apart on the tree’s southern side.

When first introduced to Europe, potatoes were blamed for causing syphilis. Both were indigenous to the New World.

Orange trees can bear fruit for over 100 years; one orange tree in France was known to bear fruit for 473 years.

Tomatoes, cucumbers, squash, peppers, okra, eggplants, olives, and avocados are all fruits or berries, botanically speaking.

Most common food plants contain natural poisons. Celery, for example, contains nitrates and psoralens

Cotton is heavier than water.

The peanut is not a nut, it is a legume. The cashew is technically a fruit.

Bananas are picked when green because if they are left on the plant until yellow, sugars will fail to form. The high starch content will prevent the fruit from becoming sweet.

Most common food plants contain natural poisons. Lima beans, for example, contain cyaogenetic glycosides.

Bananas do not, technically speaking, grow on trees. The banana plant is the largest known species of herb, since it does not have a solid trunk.

Luther Burbank developed a variety of white blackberries.

According to the Southern California Air Quality Management District, tree resin and sap are major causes of air pollution.

The grapefruit is an (accidental) man-made species. Grapefruit did not exist until citrus trees brought to Jamaica by Europeans mutated.

An ear of corn will nearly always contain an even number of rows of kernels. An ear with an odd number of rows is as rare as an albino is in most animal species.

The banana we eat comes from a plant which people have bred to have no seeds and bigger fruit than a wild banana. It cannot reproduce without human intervention.

Marijuana is illegal today because of cotton growers and wood-pulp paper mills that viewed hemp (from the marijuana plant) as a competitor. Hemp was used for cloth, rope and paper prior to the 1930's.

The angle between the main branches of a tree and its trunk remains constant in each species. It is the same angle as exists between the principal vein in the tree’s leaves and all of the branching veins.

Most common food plants contain natural poisons. Potatoes, for example, contain arsenic, amylase inhibitors, chaconine, isoflavones, nitrates, oxalic acid, and solanine.

Tobacco leaves grow quickly and contain few starches and sugars. For that reason, they are often used in the synthesis of proteins for medical use.

Most common food plants contain natural poisons. Alfalfa sprouts, for example, contain a potent toxin called canavanine, which has been linked to auto-immune diseases.

Bamboo is actually a kind of grass.