my (very rough unedited) list of zone 5 or 6 perennial nuts, roots, grains, herbs, vegetables and greens that interest me. i have only personally tried about a quarter to a third of this list
Saltbush (Atriplex nuttalli)(best edible perennial saltbush?)
Giant filbert (Corylus maxima)
Caucasian caper (Capparis herbacea)(hardiness?)
Chinese yam (Dioscorea batatas)
Caucasian spinach
Hops (variety?)
Sacred lotus (Nelumbo nucifera)
Yellow lily (Nuphar lutea)
Watercress (Ontario)
Pickerel weed (Pontederia cordata)(Ontario)
Burnet (Ontario)
Ostrich fern (Ontario)
Udo ‘sun king’
Sunchoke (variety?)(pickling removes inulin effects)
Amaranth (self seeding)(species/cultivar?)(tricolor?)
Wild leeks (Ontario)
Ramsons (Allium ursinum)
Spring beauty (Claytonia virginica)
Walking onion
Buckwheat? (10lbs/day honey per hive, 1ton/acre hay, 1500-2000lbs/acre grain)(high nutrient, bad staple)(soba)(Memil-muk)
Kernza?
Silphium integrifolium? (perennial oilseed)
Hostas (edible ground cover around trees)(Yuki Urui, longipes, montana, white feather, gentle giant, munchkin)
Horsetail (edible, mold/fungicide)
Switchgrass (Panicum virgatum)
Red clover (Trifolium pratense)(nitrogen fixer, ground cover, honey crop, edible flower)
Comfrey (bocking 14 is sterile)(good pig food)
Cirsium arvense/foliosum (used like artichoke)?(high edible oil yield, good pig feed, edible gourmet stems, highest nectar output)
Stingless nettle (Urtica galeopsifolia)(harmful to kidneys if harvested after flowering)
Peppermint (tires)
Spearmint (tires)
Basil mint (tires)
Fennel (tires)
Lovage (tires)
Marjoram (tires)
Nepitella (tires)
Oregano (tires)
Sage (tires)
Tarragon (tires)
Thyme (tires)
Garlic chives (tires)
Lemon balm (tires)
Mitsuba (tires)
Horseradish
Yellow potato onion
Scallions (tires)
Myoga ginger
Asparagus (staple)
Maidens tears (Silene vulgaris)(Ontario)
Purple plantain (plantago major) (tires)
Perennial arugula (Diplotaxis tenuifolia)(staple)
Turkish broccoli (Bunias orientalis)(staple)
Nine star cauliflower (staple)
Volherzigen dandelion
Puntarelle
Kaleidoscope kale (staple)
Russian red kale
Miner's lettuce (Claytonia perfoliata)(hardy to zone 6 but self seeds in zone 5)(omegas)(oxalates)
Spadona chicory (oxalates)
Red vein Sorrel (oxalates)
French sorrel (oxalates)
Blonde de Lyon Sorrel (oxalates)
Glaskins rhubarb (tires)
Wintergreen (Gaultheria procumbens) (tires)
Opuntia humifusa (staple) (tires)
Japanese heartnut (Juglans ailantifolia)
Carpathian walnut
Weschke black walnut
Beckwith butternut (paired with kenworthy)
Almond oracle (late bloom)(3)
Peach almond hybrid
Hazelbert
Aldara hazelnut
Ultra northern pecan deerstand
Chinese pecan (Carya cathayensis)
Chinquapin nut (2)(nsf)
Dunstan chestnut (pig feed?)
Pinus cembra
Pinus cembroides (mexican pine)(excellent flavor, 15mm, most proteine)
Pinus edulis (most commercial american species, 25mm, good cooked)
Pinus koreainus
Burton hican
Yellowhorn (oil)
Beech nut (oil)(Fagus sylvatica)(tortuosa?)
Dwarf sugarberry (celtis occidentalis)
Japanese pepper tree (Zanthoxylum piperitum)
Chinese toon (Toona sinensis)
English oak (Quercus robur)(black truffle tree)(10 trees)
Camellia japonica (oil)
Tea bush (sochi)
Tea oil (oleifera)
Jelly vine (Cocculus orbiculatus)
Barcelona filbert
Tonda di giffoni hazelnut
Uzbek pistachio
Pistacia atlantica
Musa basjoo (hardy banana)
Dolnamul (Sedum sarmentosum)
Bangpung (Peucedanum japonicum)
Monkey puzzle tree (need male/female trees)
Japanese cinnamon (Cinnamomum pedunculatum)
Miyako bamboo (Sasa nipponica)
Ennis hazelnut
Walnut franquette
Shellbark hickory 'J. Yoder No 1'
Torreya nucifera (Kaya)(oil, nut)
Phyllostachys aurea (sweetest bamboo shoots)
Phyllostachys edulis (largest shoots)(Moso)
Phyllostachys nidularia (most delicate flavored, best species to eat raw)
Echinops spinosissimus
Gundelia?
Scolymus hispanicus
Yucca baccata
Allium
Flava daylily
Yabu-kanzō (double tawny daylily)(Hemerocallis fulva)
Hibiscus (Hibiscus syriacus)(Ontario)
Hollyhock (Alcea rosea)(Ontario)
Jasmine ‘fiona sunrise’
Korean fairy bells (yunpan)(Disporum flavum)(namul)
Lavender (Ontario)
Lupine (toxic unless soaked)(species/variety?)
Mallow (Malva alcea/moschata/sylvestris)
Poppies (self seeding)
Sweet violet (Viola odorata)(Ontario)
Tigerlily (Ontario)
Bergamot (Monarda fistulosa)(Ontario)
Betony (Stachys officinalis)
Cham-namul (Pimpinella brachycarpa)(hardiness?)
Chamchwi (Doellingeria scabra)
Cicely (Ontario)
Costmary
Ephedra sinica
Horehound
Hyssop
Garlic cress (Peltaria alliacea or turkmena)
Giant hyssop (Agastache foeniculum)(Ontario)
Lemon thyme
Meadowsweet (Filipendula ulmaria)
Mint (orange, chocolate, apple, ginger)
Pepperweed (Lepidium latifolium)
Rue
Saffron
Tsi (Houittuynia)
Negi (Welsh onion)
Woodruff
Yomogi (Artemisia princeps)
Bellflower (Campanula glomerata)(Ontario)
Dames rocket (Hesperis matronalis)(Ontario)
Elecampane (Inula helenium)(used as potherb by romans)(Ontario)
Fuki (Petasites japonicus)(Ontario)
Gomchi (Ligularia fischeri)
Good king henry (oxalates)
Handsome harry (Rhexia virginica)(Ontario)
Japanese milkweed (Metaplexis japonica)
Mahonia nervosa (edible leaves, fruit)
Sandwort (Honckenya peploides)
Sea kale
Sea plantain (Plantago maritima)
Thicket bean (Phaseolus polystachios)
Water fringe (Nymphoides peltata)
Oenanthe javanica (seri)
Parasenecio delphiniifolius (sansai)
Allium macrostemon (sansai)
Anemone flaccida (sansai)
Elatostema umbellatum (sansai)Kudzu (pig feed?)
Masterwort (Aegopodium podagraria)(Ontario)
Milkweed (Asclepias syriaca)(Ontario)
Greenbriar (Smilax rotundifolia)
Perennial lettuce (Lactuca perennis)
Pink purslane (Claytonia sibirica)
Samphire (Crithmum maritimum)
Sea beet
Chestnut (schlarbaum (japanese, most cold hardy), marrone di marradi (best tasting), bouche de betizac(cold and disease hardy))
Abies grandis (grand fir)(edible fresh needles, citrus flavor)
Acer saccharinum (silver maple)(edamame like seed)
Aralia elata
Arundinaria gigantea (z5 bamboo)
Calycanthus floridus (cinnamon alternative)(toxic)
Caragana arborescens (Siberian peashrub)(Ontario)
Carya glabra (Pignut hickory)(Ontario)
Catalpa ovata (chinese bean tree)
Cercis canadensis (redbud)(edible bean pods)
Eleutherococcus sieboldianus (ukogi)
Fagus americana (american beech)(Ontario)
Ginkgo biloba (Ginkgo)(Ontario)
Gleditsia triacanthos ‘thornless’ ‘ashworth’ (honey locust)(nitrogen fixing)
Juniperus communis (european juniper)(Ontario)
Kalopanax septemlobus
Koelreuteria paniculata
Lindera benzoin (spicebush)(Ontario)
Myrica pensylvanica (wax myrtle)(bay leaf substitute)
Phyllostachys aureosulcata (z5 good to eat)
Phyllostachys propinqua (z5 good to eat)
Prinsepia sinensis (Prinsepia)(seeds have edible cooking oil)
Prunus mahaleb
Pseudotsuga menziesii (douglas fir)(citrus flavor)
Ptelea trifoliata (hop tree)(Ontario)
Pyronia veitchii
Quercus alba (large low tannin acorns)(Ontario)
Quercus dentata (emperor oak)
Sassafras albidum (sassafras)(Ontario)
Staphylea pinnata (bladder nut)
Tilia cordata (Linden)(Ontario)
Ulex europaeus (gorse)
Ulmus glabra (scotch elm)(Ontario)
Yucca filamentosa
Zanthoxylum simulans (szechuan pepper)