HERBACEOUS PLANT PROPAGATION Achillea: Clump division in spring & fall. Cuttings in mid-summer. Seeds. Aconitum (Monkshood): Clump division in spring & fall. Seeds - refrigerate seed 6 weeks. Aegopodium (A. podagraria, Snow-on-the-Mountain, Bishop’s weed, goutweed): Division in spring & fall. Seeds. Ajuga: Division any time. Seed. Allium: Seeds. Division in spring & fall. Alyssum: Division in spring. Softwood cutting in early summer. Seed as soon as ripe at 70 to 80 degrees. Anemone: Seed in spring. Root division in early spring in sand. Division in spring & fall. Anthemis tinctoria (Marguerite yellow daisy): Division in spring & fall. Cuttings in mid-summer. Seed. Antirrhinum majus (Snapdragon): Seeds in winter indoors at 55 degrees. Cuttings. Aquilegia (Columbine): Seed in spring to mid-summer. Clump division in early spring. Armeria: Clump division in spring & fall. Seeds at 70 degrees. Artemisia: Division in spring & fall. Cuttings in spring to early summer. Aruncus (Goatsbeard): Clump division. Asclepias tuberosa (Butterfly weed): Seed at 70 to 85 degrees. Aster: Clump division in early spring & fall. Seed at 70 degrees. Astilbe: Clump division in early spring. Baptisia: Clump division is difficult. Seeds as soon as ripe. Begonia: Stem cutting. Leaf cutting. Division. Seeds. Bellis (English Daisy): Division. Seeds at 70 degrees. Boltonia: Division. Seeds at 70 degrees. Browallia: Stem cuttings. Seeds at 70 degrees. Campanula (Bellflower): Seeds at 70 to 80 degrees. Division in early spring. Cuttings in early summer after flowering. Centaurea: Seeds at 70 to 80 degrees. Division in early spring. Cerastium tomentosum (Snow-in-Summer): Division in spring & fall. Cuttings in summer after flowering. Layering. Seed at 70 degrees. Ceratostigma: Division in early spring. Seed. Root cutting. Chelone (Turtlehead): Cuttings. Division. Seed. Chrysanthemum: Seeds at 70 degrees. Clump division in spring. Cuttings anytime. Cimicifuga (Bugbane): Division in early spring. Clematis: Seed - stratify 2 to 3 months. Hybrids: Softwood cuttings in spring. Leaf cuttings. Layering. Convallaria (Lily-of-the-Valley): Clump division in spring & fall. Coreopsis: Seeds. Clump division in spring & fall. Cortaderia selloana (Pampas Grass): Clump division in early spring. Dahlia: Tuber division in spring. Stem cuttings in early spring. Delphinium: Seed. Clump division in early spring. Cuttings in early summer. Dianthus: Seed. Division in early spring. Cuttings. Layering. Dicentra (Bleeding Heart): Seed - stratify for 6 weeks, difficult. Clump division in early spring. Cuttings in early summer. Root cuttings after flowering, 3" or longer. Dictamnus (Gas Plant): Seed as soon as ripe. Digitalis (Foxglove): Seed as soon as ripe. Doronicum (Leopards Bane): Division in spring & fall. Echinops (Globe Thistle): Seed. Root cuttings. Epimedium: Clump division in spring & fall. Eupatorium (Joe-Pye Weed): Seed. Division in spring & fall. Ferns: Division in early spring. Spores. Gaillardia (Blanket Flower): Clump division in spring. Seed at 70 degrees. Root cuttings. Galanthus (Snowdrops): Bulb division in fall. Geranium (Cranesbill): Seed. Division in spring. Cuttings in summer. Geum: Clump division in spring & fall. Seeds at 70 to 80 degrees. Gypsophila: Seed at 70 degrees. Cuttings in early summer. Helenium (Sneezeweed): Division in early spring. Seed. Helianthemum: Softwood cuttings in late spring. Seed at 70 to 80 degrees. Heliopsis: Clump division in spring & fall. Seed at 70 degrees. Heliotropium: Seed at 70 degrees. Cuttings in cool conditions. Layering in spring. Helleborus (Christmas Rose): Clump division in early spring & fall. Seeds when ripe - 1 year germination. Hemerocallis (Daylily): Clump division in spring & fall. Herbs: Annuals: Seeds. Perennials: Division. Cuttings. Layering. Seeds. Hesperis (Dames Rocket): Seed. Division. Cuttings. Heuchera (Coral Bells): Division in early spring. Seeds. Leaf cuttings with part of the stem in mid-summer. Hibiscus: Seeds. Hardwood cuttings. Softwood cuttings. Hosta: Division in spring & fall. Hypericum (St. Johns Wort): Division in early spring. Cuttings in early summer. Seed Iberis (Candytuft): Division in early spring. Cuttings in early summer. Seed at 70 degrees. Ipomoea (Morning Glory): Seed soaked overnight at 70 degrees. Iris: Bearded Iris: Division after blooming season is over. Japanese Iris: Clump division in early spring. Bulbous type: dig in dormant season & separate small offshoots. Seeds are difficult, must be frozen first. Kniphofia (Red Hot Poker): Seeds at 70 to 85 degrees. Clump division in spring. Lantana: Seeds. Root cuttings in early summer. Lathyrus latifolius (Perennial Pea Vine): Division in early spring. Seeds. Lavandula (Lavender): Cuttings in late summer or early fall. Clump division in early spring. Layering. Seeds Liatris (Gayfeather): Clump division in early spring. Seeds. Lilium (Lily): Bulb division in spring & fall. Bulblet separation in early fall, in sandy soil. Scale removal in spring & fall - plant points upward. Bulbils in late summer. Limonium latifolium (Sea Lavender): Division. Seed. Linaria (Toadflax): Clump division in spring & fall. Seeds. Linum (Flax): Division. Seeds. Lobelia (Cardinal Flower): Clump division in early spring. Cuttings in fall. Seed at 70 to 80 degrees. Lychnis (Campion, Maltese Cross): Clump division in fall & spring. Seeds. Lycoris (Naked Lady): Bulblet separation in late fall. Lythrum (Loosestrife): Division. Stem cuttings. Seed. Macleaya: Division. Root cuttings. Seeds. Mertensia (Virginia Bluebells): Clump division in early spring & fall. Seeds. Monarda (Bee Balm): Clump division anytime. Seed. Muscari (Grape Hyacinth): Bulb division. Narcissus (Daffodil): Bulb division after flowering in summer. Nepeta (Catmint): Clump division in early spring. Seeds. Cuttings. Layering. Oenothera (Evening Primrose): Division in early spring & fall. Seeds. Paeonia (Peony): Division in early to mid-fall. Papaver (Poppy): Seed at 60 degrees. Oriental Poppy: Division after die down. Root cuttings 3" long in fall or spring, plant horizontally 1" deep in sandy soil. Pelargonium (Geranium): Stem cuttings - allow ends to dry first. Seed at 75 to 80 degrees. Penstemon (Beardtongue): Clump division in spring & fall. Seeds at 75 degrees. Phlox: Seeds at 70 degrees. Clump division in spring & fall. Cuttings in early summer. Root cuttings 2" long in sandy soil in fall. Phlox subulata: Division. Layering. Cuttings. Physostegia (False Dragonhead): Clump division in early spring. Seeds. Platycodon (Balloon Flower): Root division in spring - difficult. Seeds. Stem cuttings in early summer. Polemonium (Jacob’s Ladder): Division in early spring & late summer. Seeds in early fall or spring. Primula (Primrose): Division in fall & spring after blooming. Seeds - freeze & thaw 3 times before planting. Pyrethrum (Painted Daisy): Division in spring & late summer. Seed in spring. Ranunculus (Buttercup): Seed. Ranunculus asiaticus: Tuberous root division in spring & fall. Rudbeckia (Black-eyed Susan): Seeds. Division. Salvia: Seeds at 70 degrees. Division. Softwood cuttings. Saponaria (Bouncing Bet): Division. Seeds. Cuttings. Saxifraga: Seeds. Division. Cuttings. Saxifraga stolonifera: Rooting of runners. Scabiosa (Pincushion Flower): Seeds. Division. Scilla: Bulb separation after blooming. Sedum (Stonecrop): Division. Cuttings - dry 1 day before planting in sand. Sempervivum (Hens & Chicks): Rosette division. Seeds. Stokesia (Stokes Aster): Clump division in early spring. Root cuttings. Seeds. Thalictrum (Meadow Rue): Division in spring & fall. Seeds. Thymus (Thyme): Seeds. Division. Layering. Tulipa (Tulip): Bulb division after blooming & die back, refrigerate until late fall before planting. Valeriana (Valerian): Clump division in early spring. Seeds. Verbascum (Mullein): Seeds as soon as ripe in mid-summer. Veronica (Speedwell): Seed. Clump division in spring. Cuttings in early summer. Vinca minor (Periwinkle): Division. Cuttings. Layering. Yucca: Offshoot separation in early spring. Root cuttings. .