I'm sorry if this would fit better under an existing discussion. Mods can feel free to move it wherever it fits best.
I made a chart that lists all the harvestables in the game and I have check marks for the ones that can be used to make nectar, jams, and/or preserves.
Click here for the chart in Google Spreadsheets. Right now it's alphabetical, but you can copy it over into Excel or your own Google spreadsheet and arrange it buy expansion pack or whatever.
I also assigned a "plant type" for people who want to arrange the plants aesthetically in their garden. (The plant I called a "bush" is the same shape for both University Life and Supernatural, but two different shades of green, hence the differentiation in my chart.)
I tried converting to BBCode, below, but it doesn't look as nice.
✓ | Harvestable | From | Rarity | Plant Type | Nectar? | Jam? | Preserve? | In buydebug? |
| Apple | Base Game | common | tree | ✓ | ✓ | ✓ | ✓ |
| Avornalino Grapes | World Adventures | uncommon | vine | ✓ | ✓ | ✓ | ✓ |
| Banana | Showtime | uncommon | tree | ✓ | ✓ | ✓ | ✓ |
| Basil | University Life | common | plant | | | | ✓ |
| Bell Pepper | Base Game | rare | plant | | | ✓ | ✓ |
| Blackberry | Store: Bohemian Fruits & Nuts | common | plant | ✓ | ✓ | ✓ | ✓ |
| Blueberry | Store: Bohemian Fruits & Nuts | common | vine | ✓ | ✓ | ✓ | ✓ |
| Bumble Leaf | University Life | rare | bush (UL) | | | | ✓ |
| Burger Patty | Base Game | special | plant | | | | ✓ |
| Buzzberry | University Life | uncommon | plant | | | | ✓ |
| Carrot | Pets | uncommon | vine | | | ✓ | ❌ |
| Chamomile | University Life | rare | bush (UL) | | | | ✓ |
| Cheese | Base Game | special | plant | | | | ✓ |
| Cherimola Blan Grapes | World Adventures | common | vine | ✓ | ✓ | ✓ | ✓ |
| Cherry | World Adventures | rare | tree | ✓ | ✓ | ✓ | ✓ |
| Cinnamon | University Life | uncommon | plant | | | | ✓ |
| Cocoa Beans | Store: Bohemian Fruits & Nuts | common | plant | ✓ | ✓ chocolate spread | ✓ chocolate | ✓ |
| Corn | Store: Grandma's Canning Station | common | plant | | | ✓ | ✓ |
| Cortado Beans | University Life | common | bean stalk | | | ✓ | ✓ |
| Cranerlet Grapes | World Adventures | rare | vine | ✓ | ✓ | ✓ | ✓ |
| Crystal Flower (kindness) | Into The Future | common | flower | | | | ✓ |
| Crystal Flower (laughter) | Into The Future | common | flower | | | | ✓ |
| Crystal Flower (love) | Into The Future | common | flower | | | | ✓ |
| Crystal Flower (neutral) | Into The Future | common | flower | | | | ✓ |
| Crystal Flower (rage) | Into The Future | common | flower | | | | ✓ |
| Cucumber | Store: Grandma's Canning Station | common | vine | | ✓ relish | ✓ pickles | ✓ |
| Death Flower | Base Game | special | plant | | | | ✓ |
| Egg | Base Game | special | plant | | | ✓ pickled eggs | ✓ |
| Flame Fruit | Base Game | special | vine | ✓ | | | ✓ |
| Forbidden Fruit | University Life | special | bulb | | | | ✓ |
| Garlic | Base Game | rare | vine | | | ✓ | ✓ |
| Ghost Chili | Supernatural | rare | bush (S) | | | | ✓ |
| Ginseng | University Life | common | bush (UL) | | | | ✓ |
| Glow Orbs | Supernatural | rare | mushroom | | | | ✓ |
| Gralladina Grapes | World Adventures | rare | vine | ✓ | ✓ | ✓ | ✓ |
| Grape | Base Game | common | vine | ✓ | ✓ | ✓ | ✓ |
| Greenleaf | University Life | uncommon | bush (UL) | | | | ✓ |
| Kona Bean | University Life | common | bean stalk | | | ✓ | ✓ |
| Lavendar | University Life | uncommon | bush (UL) | | | | ✓ |
| Lemon | Store: Humble Harvest Stand | uncommon | tree | ✓ | ✓ marmalade | ✓ | ✓ |
| Lettuce | Base Game | common | vine | | | ✓ | ✓ |
| Licorice | University Life | uncommon | plant | | | | ✓ |
| Life Fruit | Base Game | special | plant | ✓ | | | ✓ |
| Lime | Base Game | uncommon | tree | ✓ | ✓ marmalade | ✓ | ✓ |
| Mandrake | Supernatural | common | bush (S) | | | | ✓ |
| Maui Bean | University Life | common | bean stalk | | | ✓ | ✓ |
| Meloire Grapes | World Adventures | uncommon | vine | ✓ | ✓ | ✓ | ✓ |
| Midnight Bean | University Life | common | bean stalk | | | ✓ | ✓ |
| Money Bag | Base Game | special | tree | | | | ✓ |
| Mycenas | Supernatural | uncommon | mushroom | | | | ✓ |
| Omni Plant | Base Game | special | plant | | | | ✓ |
| Onion | Base Game | uncommon | plant | | | ✓ | ✓ |
| Orange | Store: Grandpa's Grove Tractor | common | tree | ✓ | ✓ marmalade | ✓ | ✓ |
| Peach | Store: Bohemian Fruits & Nuts | common | tree | ✓ | ✓ | ✓ | ✓ |
| Pear | Store: Bohemian Fruits & Nuts | common | tree | ✓ | ✓ | ✓ | ✓ |
| Pecan | Store: Bohemian Fruits & Nuts | common | tree | ✓ | ✓ | ✓ | ✓ |
| Peppermint | University Life | common | plant | | | | ✓ |
| Plasma Fruit | Late Night | special | plant | ✓ | | | ❌ |
| Plum | World Adventures | uncommon | tree | ✓ | ✓ | ✓ | ✓ |
| Pomegranate | World Adventures | uncommon | tree | ✓ | ✓ | ✓ | ✓ |
| Pomelo | World Adventures | rare | tree | ✓ | ✓ | ✓ | ✓ |
| Porcinis | Supernatural | common | mushroom | | | | ✓ |
| Potato | Base Game | uncommon | vine | | | ✓ | ✓ |
| Pumpkin | Seasons | uncommon | vine | | | ✓ | ✓ |
| Purple Eggplant | Store: Humble Harvest Stand | common | plant | | | ✓ | ✓ |
| Raspberry | Store: Bohemian Fruits & Nuts | common | plant | ✓ | ✓ | ✓ | ✓ |
| Red Berry Bean | University Life | common | bean stalk | | | ✓ | ✓ |
| Red Toadstool | Supernatural | common | mushroom | | | | ✓ |
| Red Valerian Root | Supernatural | common | bush (S) | | | | ✓ |
| Renoit Grapes | World Adventures | common | vine | ✓ | ✓ | ✓ | ✓ |
| Spotlight Mushroom | Supernatural | uncommon | mushroom | | | | ✓ |
| Steak | Base Game | special | plant | | | | ✓ |
| Strawberry | Store: Bohemian Fruits & Nuts | common | vine | ✓ | ✓ | ✓ | ✓ |
| Sweet Grass | University Life | uncommon | bush (UL) | | | | ✓ |
| Tomato | Base Game | common | plant | | ✓ ketchup | ✓ | ✓ |
| Truffles | Supernatural | rare | mushroom | | | ✓ | ✓ |
| Watermelon | Base Game | uncommon | vine | ✓ | ✓ | ✓ | ✓ |
| White Caps | Supernatural | common | mushroom | | | | ✓ |
| Wolfsbane | Supernatural | common | bush (S) | | | | ✓ |
| Wonderpetal | University Life | uncommon | bush (UL) | | | | ✓ |