to stratify or not that is the question
I'm doing a little research and learning from Gardenweeds spreadsheet flowers that need cold stratified and those that don't.
I have copied a list for you all here, however, I would suggest doing a cross reference on a plant if you really want to know.
Such as I've read Echinacea Purple cone flower likes a period of 60-90 days cold stratification however, most sorces say Ech. does not need stratified, what do you think?
Another Liatris Blazing Star - Gayfeather, there seems to be mixed opinions. the website I'm going to post seems to think many of our perennials do not need stratified. If you have a different opinion please shout it out, lets all get on the same page.
Here's the site:
EASY GERMINATORS: These seeds are great ones to get started with, especially if you plan to sow seeds indoors under lights. None require any special cold treatment. Just sow as for tomatoes or peppers but allow 6 to 12 weeks for germination:
Achillea (Yarrow), Alcea (Hollyhock), Alyssum (Perennial Alyssum), Anthemis (Perennial Marguerite), Aquilegia (Columbine), Arabis (Wall Cress), Armeria (Thrift), Aster, Aubrieta (Rock Cress), Aurinia (Basket-of-Gold), Bellis (English Daisy), Campanula carpatica, Campanula persicifolia (Bellflower), Catananche (Cupid's Dart), Centaurea (Cornflower), Centranthus (Red Valerian), Cerastium (Snow-in-Summer), Coreopsis (Tickseed), Cynara (Cardoon, Globe Artichoke), Dianthus (Pinks, Carnations, Sweet William), Digitalis (Foxglove), Doronicum (Leopard's Bane), Echinacea purpurea (Purple Coneflower), Echinops (Globe Thistle), Erigeron (Fleabane Daisy), Erysimum allionii (Siberian Wallflower), Gaillardia (Blanket Flower), Geum (Avens), Gypsophila (Baby's-Breath), Helenium (Helen's Flower), Hesperis (Dame's Rocket), Heuchera (Old-fashioned Coral Bells), Kniphofia (Torchlily), Leucanthemum (Shasta Daisy), Liatris (Blazingstar), Limonium (Sea Lavender), Linum perenne (Blue Flax), Lunaria (Money Plant, Silver Dollar), Lupinus (Lupine, best sown directly outside in late spring), Lychnis (Campion), Malva (Mallow), Monarda (Beebalm), Myosotis sylvatica (Forget-me-not), Origanum (Oregano), Papaver (Poppy), Physostegia (Obedient Plant), Polemonium (Jacob's Ladder), Potentilla (Cinquefoil), Rudbeckia hirta (Gloriosa Daisy), Salvia (Perennial Sage), Stachys (Lamb's Ears), Tanacetum (Painted Daisy, Feverfew), Thymus serpyllum (Mother-of-Thyme), Verbascum (Mullein), Verbena, Veronica most tall types (Speedwell), Viola hybrids (Winter Pansy).
FOR ADVANCED SEED STARTERS ONLY: These seeds are trickier to handle. Many are tiny, and most require a special cold treatment or absolutely nothing will happen. See the germination link above for specific details:
Acanthus (Bear's-Breeches), Aconitum (Monkshood), Alchemilla (Lady's Mantle), Alstroemeria (Peruvian Lily), Anemone (Windflower), Angelica, Arum, Aruncus (Goat's Beard), Asarum (Wild Ginger), Asclepias (Milkweed), Astrantia (Masterwort), Baptisia (False Indigo), Bergenia, Buddleia (Butterfly Bush), Caltha (Marsh Marigold), Caryopteris (Bluebeard), Chelone (Turtlehead), Chrysogonum (Golden Star), Cimicifuga (Bugbane), Clematis, Corydalis (Fumitory), Crambe (Seakale), Cyclamen, Delphinium, Dicentra (Bleedingheart), Dictamnus (Gas Plant), Dodecatheon (Shooting Star), Eremurus (Foxtail Lily), Eryngium (Sea Holly), Eupatorium (Boneset), Euphorbia (Spurge), Filipendula (Meadowsweet), Fuchsia, Gaura (Butterfly Gaura), Gentiana (Gentian), Geranium species (Cranesbill Geranium), Goniolimon (German Statice), Gunnera, Helianthemum (Rock Rose), Helianthus (Perennial Sunflower), Heliopsis (False Sunflower), Helleborus (Christmas & Lenten Rose), Heuchera hybrids (Fancy-leaf Coral Bells), Hibiscus (Hardy Hibiscus), Hypericum (St. John's-Wort), Iberis (Perennial Candytuft), Incarvillea (Hardy Gloxinia), Iris species, Jasione (Shepherd's Bit), Kirengeshoma (Waxbells), Knautia (Crimson Scabious), Lathyrus (Perennial Sweet Pea), Lavandula (Lavender), Lavatera (Tree Mallow), Leontopodium (Edelweiss), Lewisia, Ligularia, Lobelia, Lysimachia (Loosestrife), Macleaya (Plume Poppy), Mazus (Creeping Mazus), Mertensia (Virginia Bluebells), Myrrhis odorata (Sweet Cicely), Nepeta (Catmint), Oenothera (Evening Primrose, Sundrops), Omphalodes (Naval-seed), Penstemon (Beard-tongue), Perovskia (Russian Sage), Persicaria (Fleeceflower), Phlomis, Phlox (all types), Physalis (Chinese Lantern), Platycodon (Balloon Flower), Podophyllum (May Apple), Primula (Primrose, all types), Pulsatilla (Pasque-flower), Ranunculus (Buttercup), Ratibida (Prairie Coneflower), Rheum (Rhubarb), Rodgersia, Rosmarinus (Rosemary), Rudbeckia (Black-eyed Susan, most types), Rumex sanguineus (Bloody Dock), Sanguinaria (Bloodroot), Sanguisorba (Burnet), Saponaria (Soapwort), Saxifraga (Saxifrage), Scabiosa (Pincushion Flower), Sedum (Stonecrop), Sempervivum (Hen-and-Chicks), Sidalcea (Prairie Mallow), Silene (Campion, Catchfly), Sisyrinchium (Blue-eyed Grass), Stokesia (Stokes' Aster), Teucrium (Germander), Thalictrum (Meadow-rue), Tiarella (Foamflower), Tradescantia (Spiderwort), Tricyrtis (Toad-lily), Trollius (Globeflower), Vernonia (Ironweed), Veronica Dwarf Types (Speedwell), Veronicastrum (Culver's-root), Viola species types (Violets), Waldsteinia (Barren Strawberry), Zantedeschia (Calla Lily).
Here is a link that might be useful: Perennial germination