Animal Crossing: New Leaf

Flower Breeding

Cosmos & Lilies

• Pink: red + white (Lilies can also make pink w/red^2)
• Orange: red + yellow
• Black: red + red

Pansies

• Orange: red + yellow
• Blue: white + white
• Purple: orange + blue

Tulips

• Pink: red + white
• Orange: red + yellow
• Black: red + red
• Purple: orange + orange

Roses (AUGH)

• Pink: red + white OR red^2
• Black:red^2
• Purple: white^2
• Orange: red + yellow
• Blue:
  1. Orange + Purple: red_op
  2. red_op^2 will very rarely make a blue rose
• Black: water a wilted black rose w/the gold watering can

Carnations & Violets

You get a pink carnation on Mother's Day and a red carnation on Father's Day. You can get a white carnation by breeding the pink and red.

You get a blue violets by breeding purple and white.

Fruits

Native Fruits

• Apples
• Cherries
• Oranges
• Peaches
• Pears

Non-Native Fruits

• Banana - In Inventory, not planted yet
• Coconut - In Inventory, not planted yet
• Durian - In Inventory, not planted yet
• Lemon - In Inventory, not planted yet
• Lychee
• Mango - In Inventory, not planted yet

TL;DR

I've been playing ACNL lately, but found guides hard(er) to find or I found sites riddled with ads. (Which makes referencing stuff on my phone hard...)

This information was sourced from Thonky's Guide. (Maybe it's bad form to copy any of it, but this is a striped down version of the information I want to reference quickly.)