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Seed Germination Chart

Some Abbreviations Used
A: Annual - a plant which lives one year only from seed.
P: Perennial - a plant which comes back every year.
H: Indicates a plant hardy in northern zones.
T: Indicates a tender plant, shrub (sh), or tree (t) which will not winter over in northern zones.
IS: In Situ; can be planted outside directly where it is to grow.
JC: Just Cover; barely cover with soil
SS:Surface Sow; press seeds gently into to the soil to make good contact, but do not cover with any additional soil; these seeds require light to germinate.
L/D: Light or Dark; seeds which require dark should have the flat covered with newspaper or brown paper or something similar to keep light from getting to the seeds. Plants requiring light to germinate are to be surface sown.
S/I: Germination is slow and irregular
HH: Half hardy. If an annual, it will usually not reseed itself in northern zones, and if perennial, will be killed by freezing temperatures.
TP: Tender perennial (or shrub, etc). Will not winter over in northern zones, but makes a good greenhouse specimen.
GHS: Tropical or delicate plant best grown in greenhouse.
BB: Bulb.

NOTE: The heading 'Medium' refers to a sterile potting soil.

PlantDays for
Temp °FMediumDepth of
Special Info
Hacquetia (hp)30-180 s/i.55Well-drained JC.
Haemanthus (tbb)7-45.60-65Peaty JC.
Hamamelis (hsh/t)270-365 s/iL50-60Peaty 1/16"#4; 3 months at 70°F, then 3 months cold.
Haplopappus (hp)21-30.60-70Well-drained 1/8".
Hardenbergia (hhp)30-90 s/i.55-65Well-drained 1/8"#2 for 24 hours.
Harpephyllum (tp)10--30.70-75Peaty ¼"#2 for 24 hours.
Haworthia (hhp)21-60L60-65Well-drained JC.
Hebe (hhsh)15-30.70Peaty JC.
Hedychium (hhp)20-25.70-75Peaty 1/16"#2 for 2 hours.
Hedysarum (hp)14-42.55-65Well-drained 1/16".
Helenium (hp)7-10.70Peaty 1/16" Reduce temp at night. Can be sown IS.
Helianthemum (hp)15-20.70-75Well-drained SSSee Begonia
Helianthus (ha)10-14.70-85Peaty ¼"Can be sown IS.
Helichrysum (hha)7-10L65-75Well-drained SS.
Heliophila (hha)14-21.60-65Well-drained 1/16".
Heliopsis (hp)10-15.70Well-drained 1/16".
Heliotropium (hhp)14-45 s/i.65-75Well-drained 1/16".
Helipterum (ha)14-20.65-75Peaty 1/16"Can be sown IS.
Helleborus (hp)30-540 s/i.60-65Well-drained JCSee Bonsai May require being wintered
outside for 2 years.
Hemerocallis (hp)21-50.60-70Well-drained 1/8"#3 for 6 weeks.
Hemiphora (tp)30-120 s/i.70-75Peaty JC.
Hepatica (hp)30-360 s/iL50-55Well-drained JC#3 for 3 weeks.
Heracleum (hp)30-90.-Well-drained ¼"Sow IS. See Bonsai
Hemiaria (hp)10-12.70Well-drained JC.
Hesperis (hb)20-25L70-85Peaty SSReduce temp at night. Can be sown IS.
Heuchera (hp)10-60 s/iL65-70Well-drained SS.
Hibiscus (hhp,ta)15-30 s/i.75-80Peaty 1/16"#1 and #2
Hibiscus (hsh)30-60 s/i.70-75Well-drained 1/16"#2
Hieracium (hp)21-30.50-60Well-drained JC.
Hippeastrum (hhbb)30-45.75Peaty 1/8".
Hippophae (hsh)30-180 s/iL55-65Well-drained JC#3 for 14 weeks.
Hollyhock (ha,hb,hp)10-12L60-70Peaty SSCan be sown IS.
Holmskioldia (tsh)30-90 s/i.60-65Well-drained JC.
Holodiscus (hsh)30-180 s/iL60-65Well-drained SS.
Hosta (hp)30-90 s/i.50Peaty 1/16"Keep medium slightly moist.
Humulus (hp)25-30.70-75Well-drained ¼"Can be sown IS.
Hunnemannia (hha)15-20.70-75Well-drained 1/16"Can be sown IS.
Hutchinsia (hp)14-30.-Well-drained ¼"Best sown IS.
Hyoscyamus (hb,ha)14-45.-Well-drained 1/8"Best sown IS.
Hypericum (hsh)30-90 s/i.50-55Well-drained JC.
Hypoestes (tp)10-21.70-75Well-drained JC.
Hyssopus (hp)14-45.60-70Peaty 1/16"

© 2001 by Ernestina Parziale