I went to my grandparents rescheduled 60th anniversary party recently and found out that blackberry bushes only produce every other year on the same growth. After looking into it I found other plants that also bear fruit, or at least more fruit, every other year.
One that suprised me was pecan trees. I just figured they produced what the season allowed, with some years thinner than others. Come to find out they produce better every other year.
Blueberries also produce every other year.
Some apples produce well every other year. Although the fruit is always edible it isn't always what you're looking for.
What makes trees and plants produce this way? Well, I'll tell you.
Fruit production takes a lot of energy, some plants only produce a single fruit, like pineapple. The stress the plant feels takes a while to come back from and depending on the plant can be over a year long before it's ready to produce well again.
Speaking of pineapples, I'm going to try and I'm going to fail to get my pineapple plant to produce another fruit. The fruit is turning yellow already and softening up. the base looks ok at the moment but from what I've been told it can't make another fruit.