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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
Tacca (tp)30-270 s/i.80-85Peaty 1/8"#2 for 4 days.
Tacitus (hhp)30-90 s/iL50-60Well-drained SS.
Tamarix (hsh)30-60L65-70Peaty SSSee Begonia
Taxodium (ht)14-60L70 PeatySS#3 for 4 weeks.
Taxus (ht)365+ s/iL70 Peaty1/16"#4; 3 months at 70ºF, then 3 months cold, followed by another 3 months at 70ºF.
Tecophilaea (hbb)30-365 s/i.50-55Peaty 1/16"Keep slightly moist.
Tellima (hp)30-90 s/i.55-60Well-drained SSSee Bonsai
Tephrosia (hp)21-45.65-70Well-drained JC#1 and #2.
Tetranema (tp)14-30.65-75Peaty JC.
Teucrium (hp)25-30.70Well-drained SS.
Thalictrum (hp)14-21.50-60Well-drained 1/8".
Thermopsis (hp)14-30.70Well-drained 1/16"#2.
Thunbergia (hha)14-21.70-75Peaty JCKeep slightly moist.
Thuja (hsh)14-60 s/iL55 PeatySS#3 for 4 weeks.
Thymus (hp)14-30L55 PeatySSSee Begonia
Tiarella (hp)14-90 s/i.50Well-drained SSSee Bonsai
Tibouchina (tsh)30-90 s/iL60-70 PeatySSSee Begonia
Tigridia (h/hhbb)30-90 s/i.55-60Well-drained 1/16".
Tillandsia (tp)30-90 s/iL60-70 PeatySSSee Begonia
Tithonia (hha)5-14L70 Well-drainedSS.
Torenia (ta)14-30L70-75Peaty SSSee Begonia
Townsendia (hp)30-90 s/i.60Well-drained 1/16"See Bonsai
Trachelium (hhp)15-21L55-60Well-drained SS.
Trachycarpus (ht)40-90 s/iL55-65Peaty SS#3 for 4 weeks.
Trachymene (hha)15-30D70 Well-drained1/16"Take extra care when transplanting.
Tradescantia (hp)30-40 s/i.70Peaty JCReduce temp at night.
Tree ferns (hhp)30-120 s/iL65-75Peaty SSSee Ferns
Trichosanthes (hha)14-30.65-75Peaty 1"Sow individually in 2" pots.
Tricyrtis (hp)30-90 s/i.65-70Well-drained 1/8"Keep slightly moist.
Trillium (hp)545+ s/i.60-70Well-drained SS#4; with 2 periods of cold.
Tripteris (ha)5-14.60-65Well-drained 1/8"Can be sown IS.
Trollius (hp)30-365 s/i.50Well-drained SS#3 for 2 weeks.
Tropaeolum (ha)10-15.55-65Peaty ¼"Can be sown IS.
Tropaeolum speciosum (hp)365-720 s/i.55-60Well-drained JC.
Tsuga (ht)10-60 s/iL60 PeatySS#3 for 3 months.
Tulipa (hbb)60-90 s/i.50Well-drained 1/8"See Bonsai
Tunica (hp)14-60 s/i.50Well-drained 1/16"See Bonsai
Tweedia (tp)30-90 s/i.75Well-drained JC.

© 2001 by Ernestina Parziale