These items are not available until Year 2:
Adzuki Bean Seeds
  Beefvine Seeds
  Benne Sesame Seed
  Black Huckleberry Seeds
  Black Magic Viola Seeds
  Black Mulberry Seeds
  Black Petunia Seeds
  Black Velvet Petunia Seeds
  Bleeding Heart Seeds
  Blue Borage Seeds
  Blue Borage Seeds
  Blue Corn Seeds
  Boochya Starter
  Burdock Seeds
  Cardamom Seeds
  Carnation Seeds
  Cashew Sapling
  Chanterelle Starter
  Chayote Seeds
  Chickenvine Seeds
  Chrysanthemum Seeds
  Clematis Starter
  Clove Sapling
  Coal Seeds
  Common Mushroom Starter
  Copper Seeds
  Cotton Seeds
  Cowpea Seeds
  Crocus Seeds
  Dahlia Seeds
  Daisy Seeds
  Date Sapling
  Doubloon Seeds
  Dragon Fruit Sapling
  Duckvine Seeds
  Elderflower Seeds
  English Rose Seeds
  English Rose Starter
  Fairy Duster Pod
  Fancy Peony Seeds
  Fragrant Peony Seeds
  Fragrant Wisteria Sapling
  Freesia Bulb
  Freesia Bulb
  French Lilac Starter
  Futsu Pumpkin Seeds
  Giant Allium Seeds
  Giant Spring Bells Seeds
  Gold Seeds
  Granny Smith Sapling
  Green Zinnia Seeds
  Herbal Lavender Seeds
  Herbal Peony Seeds
  Hibiscus Sapling
  Hibiscus Starter
  Holly Seeds
  Hyacinth Seeds
  Iris Bulbs
  Iron Seeds
  Jerky Sapling
  Lily Bulbs
  Lotus Starter
  Magnolia Sapling
  Magnolia Seed
  Marigold Seeds
  Morning Glory Starter
  Moss Blossom Starter
  Papaya Sapling
  Peppercorn Seeds
  Perilla Seeds
  Persimmon Sapling
  Petunia Starter
  Pistachio Sapling
  Plantain Sapling
  Porkvine Seeds
  Purple Beauty Bell Pepper Seeds
  Purple Coneflower Seeds
  Queen of the Night Tulip Seeds
  Red Jazz Seeds
  Red Sorrel Seeds
  Rose Starter
  Salsify Seeds
  Scotch Bonnet Pepper Seeds
  Shiso Seeds
  Sleeping Beauty Seeds
  Stevia Plant Seeds
  Turkey Seeds
  Vanilla Sapling
  Vernal Seeds
  Walnut Sapling
  Wasabi Seeds

These items are not available until Year 3:
Alpaca Seeds
  Amethyst Basil Seeds
  Arctic Raspberry Seeds
  Artichoke Thistle Seeds
  Asian Pear Sapling
  Beast Seeds
  Bird Seeds
  Bison Seeds
  Bixite Flower Seed
  Black Bean Seeds
  Black Cosmo Seeds
  Black Goji Berry Seeds
  Blackcurrant Seeds
  Blood Orange Sapling
  Blue Corn Seeds
  Blue Cosmo Seeds
  Blue Zinnia Seeds
  Camas Seeds
  Camellia Seeds
  Candy Roaster Squash Seeds
  Cherimoya Sapling
  Chevonvine Seeds
  Chinese Artichoke Seeds
  Cinder Flower Seeds
  Cinnamon Sapling
  Cloudberry Seeds
  Cocoa Sapling
  Cosmo Seeds
  Delphinium Starter
  Durian Sapling
  Earth Crystal Cat Seeds
  Eucalyptus Sapling
  Fire Quartz Rose Seeds
  Four Corner Potato Seeds
  Fowl Seeds
  Fragrant Lavender Seeds
  Frog Seeds
  Frozen Leaf Sapling
  Garnet Sweet Potato Seeds
  Geranium Seeds
  Ginkgo Seed
  Green Algae Starter
  Green Chile Seeds
  Guarana Seeds
  Hardy Kiwi Seeds
  Herbal Indigo Seeds
  Hopniss Seeds
  Horse Seeds
  Hungarian Chile Seeds
  Incan Ground Cherry Seeds
  Indigo Rose Tomato Seeds
  Iridium Seeds
  Jackfruit Sapling
  Jasmine Sapling
  Jujube Sapling
  Julep Mint Seeds
  Kola Sapling
  Kulli Corn Seeds
  Kumquat Sapling
  Kutjera Seeds
  Lingonberry Seeds
  Long Island Cheese Pumpkin Seeds
  Lotus Starter
  Mamey Sapote Sapling
  Mangosteen Sapling
  Mayhaw Sapling
  Melaleuca Sapling
  Morel Mushroom Starter
  Mung Bean Seeds
  Muttonvine Seeds
  Myrtle Leaved Orange Sapling
  Nasturtium Seeds
  Oats Seeds
  Oca Seeds
  Orange Cosmo Seeds
  Oysternut Seeds
  Pandan Sapling
  Pawpaw Sapling
  Pink Cosmo Seeds
  Plumeria Seeds
  Poinsettia Starter
  Pomelo Sapling
  Prickly Pear Seeds
  Purple Beauty Bell Seeds
  Purple Clematis Starter
  Purple Pluot Sapling
  Purple Zinnia Seeds
  Quartz Rose Seeds
  Quince Sapling
  Rabbitvine Seeds
  Radioactive Seeds
  Red Carrot Seeds
  Red Mushroom Starter
  Reptile Seeds
  Sacret Water Lotus Seeds
  Sakura Seed
  Salal Seeds
  Samphire Seeds
  Sea Buckthorn Seeds
  Seaweed Starter
  Skirret Seeds
  Stone Pine Sapling
  Summer Squash Seeds
  Sweet Basil Seeds
  Sweet Granadilla Seeds
  Tamarind Sapling
  Tiger Nut Seeds
  Tomatillo Seeds
  Tranquil Peony Seeds
  Ube Seeds
  Ume Sapling
  Venison Seeds
  White Algae Starter
  White Alpine Strawberry Seeds
  White Cosmo Seeds
  White Currant Seeds
  Wild Boar Seeds
  Wild Wisteria Starter
  Windflower Seeds
  Yacon Seeds
  Yellow Cosmo Seeds
  Yellow Onion Seeds
  Yellow Zinnia Seeds
  Ylang Ylang Sapling
  Yuzu Sapling
  Zinnia Seeds

These items are not available until Year 4:
Abiu Sapling
  Acerola Sapling
  Achachairu Sapling
  Alphonso Mango Sapling
  American Persimmon Sapling
  Amethyst Rose Seeds
  Arcane Seaweed Starter
  Black Boy Peach Sapling
  Black Diamond Apple Sapling
  Black Madeiria Fig Sapling
  Black Persimmon Sapling
  Black Ruby Plum Sapling
  Black Sapote Sapling
  Black Worcester Pear Sapling
  Bunya Bunya Sapling
  Canistel Sapling
  Chaunsa Mango Sapling
  Chilean Guava Sapling
  Chocolate Persimmon Sapling
  Clover Seeds
  Cupuacu Sapling
  Dragon Eye Longan Sapling
  Emerald Flower Seed
  Fire Opal Cat Seeds
  Gerbera Seeds
  Golden Rose Starter
  Guanabana Sapling
  Hass Avocado Sapling
  Honey Fig Sapling
  Hydrangea Starter
  Ice Cream Bean Sapling
  Jade Rose Seeds
  Jamaican Cherry Sapling
  Kru Banana Sapling
  Langsat Sapling
  Lilly Pilly Sapling
  Lily of the Valley Seeds
  Loquat Sapling
  Macadamia Nut Sapling
  Macadamia Sapling
  Magma Cap Spores
  Mahachanok Mango Sapling
  Medlar Sapling
  Monkey Pot Sapling
  Mum Seeds
  Palmyra Palm Sapling
  Peanut Butter Fruit Sapling
  Pedalai Sapling
  Pistachio Nut Sapling
  Pitogo Banana Sapling
  Poshte Sapling
  Pulasan Sapling
  Purple Mushroom Starter
  Red Banana Sapling
  Red Jaboticaba Sapling
  Red Walnut Sapling
  Rollinia Sapling
  Ruby Flower Seed
  Ruby Guava Sapling
  Rumberry Sapling
  Salak Palm Sapling
  Sapodilla Sapling
  Saskatoon Berry Sapling
  Shipova Sapling
  Sunrise Papaya Sapling
  Tiger Fig Sapling
  Topaz Cat Seeds
  Topiary Seed
  Twisted Sapling
  Void Rose Starter
  Wattleseed Sapling
  Weeping Sakura Seed
  White Sapote Sapling
  Wishing Bamboo Cuttings
  Ya Li Pear Sapling
  Yellow Pitahaya Sapling

These items are not available until Year 5:
Black Clover Seeds
 Clover Patch Starter
 Fern Flower Seeds
 Mandrake Seeds
 Marzipansy Seeds
 Modern Art Starter
 Origami Starter
 Paper Petal Starter
 Rosette Starter
 Shredrose Starter
 Starflower Seeds
 Treasure Plant Starter
 White Chocobloom Seeds
 White Christmas Tree Seed

These items are not available until Year 6:
Prismatic Seeds
Truffle Spore Starter

These items are not available until Year 7:
Apple of Discord
  Apple of Iddun
  Bodhi Sapling
  Corpse Flower Sapling
  Dryad Sapling
  Forest Rose Sapling
  Fusang Sapling
  Infernal Sapling
  Jungle Moss Sapling
  Maenad Sapling
  Moonberry Sapling
  Polar Berry Sapling
  Polar Berry Sapling
  Sunberry Sapling
  Winter Starberry Sapling
  Yateveo Sapling
  Yggdrasil Sapling
  Gilded Coconut Sapling
  Gilded Walnut Sapling
  Stardrop Sapling



If ExcludeFromMixedSeeds is enabled, these crops will never appear in Mixed Seeds
Ancient Ferns
Ancient Fruit
Fungus Tree
Ginger Ginseng
Joja Berry Machine
Joja Veggie Machine
Monster Stalk
Salal Shrub
Shadow Crop
Slime Bush
Tarot Root

If ForageBalance is enabled, these forageables will not appear until Year 2:
Ancient Coin
  Aneumushroom
  Bear Claw
  Berserker Mushroom
  Black Pearl
  Black Walnut
  Cashew
  Chestnut
  Coco De Mer
  Deer Antler
  Dryad's Saddle
  Eagle Feather
  Fan Seashell
  Fern Flower
  Flamingo Feather
  Frost Cap
  Gem Cap
  Giant Pearl
  Ginkgo Leaf
  Glass Buoy
  Golden Chest
  Hawk Feather
  Hawthorn Berry
  Heliconia
  Honeyberry
  Honeycomb
  Horn Nut
  Lucky Clover
  Luminushroom
  Macadamia Nut
  Macaw Feather
  Megalodon Tooth
  Mermaid's Purse
  Parrot Feather
  Passion Flower
  Peacock Feather
  Pecan
  Psilocybin Mushroom
  Radioactive Mushroom
  Sea Dragon
  Sea Heart
  Sea Sponge
  Seahorse
  Shark Tooth
  Silver Coin
  Spiral Seashell
  Sunstar
  Thunder Cap
  Tortoise Shell
  Treasure Chest
  Unlucky Clover
  Void Mushroom
  Waldmeister
  Walnut
  Woodruff
  Wormwood
  Yarrow Leaf

If ForageBalance is enabled, these forageables will not appear until Year 4:
Alkonost Feather
  Golden Antler
  Golden Feather
  Hellhound Fang
  Iridium Feather
  Jackalope Antlers
  Leviathan Scale
  Nagual Whiskers
  Phoenix Feather
  Radioactive Feather
  Resplendent Feather
  Roc Feather
  Seraph Feather
  Silver Feather
  Thunderbird Feather
  Wendigo Antler
  Werewolf Claw