Growing figs, bananas, and pineapples, and citrus is quite a treat. If living in a climate with warm winters - Walmart will sell growing potted figs, bananas, and citrus. Here in Nashville TN area it is too cold in the winter outdoors, but as an indoor potted plant Lowes sells pineapples in the garden dept, and a local garden center sells dwarf jamacian red bananas. Figs would have to be ordered from the web.
But to start "free" pinapples go to a grocery store that cuts their own pineapples, ask for a box of tops. Twist the "meat" of the pineapple of of the top and remove 1 inch of leaves offf of the bottom end of the foilage part of the top. Plant a few of the tops in a larger big potted citrus as kitty latrine protection, or in a pot of dirt kept moderatly moist and out of direct sunlight, a few should survive and become nice but very spiky houseplants.
Bananas love lots of water but not continually wet feet, and lots of feeding. They will grow "pups" and fruit when mature enough if the roots stay 75 degrees F. during fruiting season (Oct aprox. after 1 yr in northern hemisphere.) Caution if you use a frontend loader and manure to feed a row of jamacian red bananas - instead of being 5-6 feet tall, they will be 15-20 feet tall, one fellow living near us when in southern Alabama did that and ......... zoom zoom.
Figs are different, they are light feeders and have a shallow mat of feeder roots 1-6 inches below ground. Too much nitrogen and they spike vegatation and tall non fruiting thin trunks skyward, all thin trunk, limbs, leaves, and no fruit. Phosperous and potash and minerals feed their conditions for fruiting better once the leaves start to bud.
Some lemons and grapefruit come true from seed, it just takes longer, and grafted plants are built in with desirable characteristics.