| Hedysarum coronarium - Lightly cover seeds and use 70ºF, if no germination in 4 weeks, move to the fridge for 3 weeks then back to 70F. |
| Helenium autumnale "Red & Gold Hybrids' - lightly cover seeds and use F 70, germination in 7-10 days. |
| Helenium hoopesi - lightly cover seeds and use F 70, germination in 7-10 days. |
| Helianthemum nummularium - Germination in less than 2 weeks at 73ºF surface sow-light needed for best results, rapid germination |
| Helianthus annuus - Germination in less than 2 weeks at 68ºF, rapid germination |
| Helichrysum bracteatum - Germination in less than 2 weeks at 75ºF surface sow-light needed for best results, rapid germination |
| Helichrysum italicum - Germination in less than 2 weeks at 68ºF surface sow-light needed for best results, rapid germination |
| Heliopsis scabra - Germination in less than 2 weeks at 75ºF, rapid germination |
| Heliotropium arborescens 'Mini Marine' - Germination in less than 2 weeks at 68-75ºF, rapid germination. |
| Hemerocallis ' Mix' - Sow in a plastic bag with moist seed mix and put in the fridge for three weeks. Then sow by covering seeds and use 55F, germination will start in 2 weeks and will be spread out over a month or two. |
| Hemerocallis ' Select Tetraploid Mix' - Sow in a plastic bag with moist seed mix and put in the fridge for five weeks. then sow by covering seeds and use 55-65F, germination will start in 2 weeks and will be spread out over a month or two. |
| Hemerocallis ''Diploid Mix' - Sow in a plastic bag with moist seed mix and put in the fridge for five weeks. then sow by covering seeds and use 55 -65F, germination will start in 2 weeks and will be spread out over a month or two. |
| Hemerocallis 'Miniature Hybrids Mix' -Sow in a plastic bag with moist seed mix and put in the fridge for five weeks. then sow by covering seeds and use 55 -65F, germination will start in 2 weeks and will be spread out over a month or two. |
| Hemerocallis 'Tetraploid Mix' - Sow in a plastic bag with moist seed mix and put in the fridge for five weeks. then sow by covering seeds and use 55-65F, germination will start in 2 weeks and will be spread out over a month or two. |
| Hepatica triloba - sow outdoors in the fall for spring germination |
| Heracleum sp - Germination in less than 2 weeks at 68ºF, rapid germination |
| Hesperis matronalis - Germination is spread out over many weeks at 68ºF, slow germination |
| Hesperis matronalis alba - Germination is spread out over many weeks at 68ºF, slow germination |
| Heuchera americana 'Dale's Strain' - Surface sow, seed is very small, keep medium moist at all times but not wet. Use glass or plastic to cover trays or pots. Germination at F 65 in 1-6 weeks. for best results hardyplants.com/seed_starting_.html |
| Heuchera 'Bressingham Mix' - Surface sow, seed is very small, keep medium moist at all times but not wet. Use glass or plastic to cover trays or pots. Germination at F 65 in 1-4 weeks. |
| Heuchera micrantha - Germination in less than 2 weeks at 68ºF surface sow-light needed for best results, rapid germination |
| Heuchera sanguinea 'Crimson' - Surface sow, seed is very small, keep medium moist at all times but not wet. Use glass or plastic to cover trays or pots. Germination at F 65 in 1-4 weeks. |
| Heuchera sanguinea 'Sanguinea' - Surface sow, seed is very small, keep medium moist at all times but not wet. Use glass or plastic to cover trays or pots. Germination at F 65 in 1-4 weeks. |
| Heuchera sanguinea 'Slendens' - Surface sow, seed is very small, keep medium moist at all times but not wet. Use glass or plastic to cover trays or pots. Germination at F 65 in 1-4 weeks. |
| Heuchera sanguinea 'Vivid' - Surface sow, seed is very small, keep medium moist at all times but not wet. Use glass or plastic to cover trays or pots. Germination at F 65 in 1-4 weeks. |
| Heuchera villosa var. macrorhiza - Germination in less than 2 weeks at 68ºF surface sow-light needed for best results, rapid germination |
| Hibiscus acetosellus 'Red Shield' - Soak seeds in hot water for two days, change the water every 12 hours with fresh water. Sow seeds by covering them with seed medium, darkness needed for best germination, use 75F, 10-14 days. |
| Hibiscus acetosellus 'Red Shield' -Sow outdoors, Germination in less than 2 weeks at 68ºF, rapid germination. |
| Hibiscus 'Carolina Red Shades' (5) - Scratch with a nail and soak seeds in hot water for two days, change the water every 12 hours with fresh water. Sow seeds by covering them with seed medium, darkness needed for best germination, use F 75, 10-20 days. |
| Hibiscus mosheutos 'Southern Bell Mixed' - Scratch with a nail and soak seeds in hot water for two days, change the water every 12 hours with fresh water. Sow seeds by covering them with seed medium, darkness needed for best germination, use F 75, 10-20 days. |
| Hibiscus mosheutos ssp. palustris 'Mixed' - Scratch with a nail and soak seeds in hot water for two days, change the water every 12 hours with fresh water. Sow seeds by covering them with seed medium, darkness needed for best germination, use F 75, 10-20 days. |
| Hibiscus syriacus - sow outdoors, Germination in less than 2 weeks at 68ºF, rapid germination |
| Hibiscus trionum 'Simply Love' - Scratch with a nail and soak seeds in hot water for two days, change the water every 12 hours with fresh water. Sow seeds by covering them with seed medium, darkness needed for best germination, use F 75, 10-20 days. |
| Hieracium lanatum - Germination in less than 2 weeks at 68ºF, rapid germination |
| Hieracium maculatum 'Leopard' - Lightly cover seeds, germination in 10-25 days at 60-70F. If no germination move to 32-39F for four weeks then back to 65F. |
| Hieracium umbellatum - Lightly cover seeds, germination in 10-25 days at F 60. |
| Hieracium villosum - Lightly cover seeds, germination in 10-25 days at F 60. |
| Hippeastrum (Amaryllis) 'Large Flowering Hybrids' - Lightly cover seeds, use 75F, germination takes 3-5 weeks. |
| Holodiscus discolor - 4 weeks at 68ºF, 4 weeks at 39º, move to 50º for germination |
| Hordeum jubatum - Germination in less than 2 weeks at 68ºF, rapid germination |
| Hosta 'Mixed' - Lightly cover seeds, germination 7-25 days at F.65 - 85. Can be grown over winter under 24 hour lights with very good results. |
| Hypericum sp - Germination in less than 2 weeks at 75ºF surface sow-light needed for best results, rapid germination |
| Hyssopus officinalus - Germination in less than 2 weeks at 68ºF, rapid germination if no germination, chill for 2 weeks. |