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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
Paeonia (hp)365+ s/iL50-60Well-drained JCKeep moist and in shade.
Paeonia (hsh)270+ s/iL70 Well-drainedJC#4
Palms (tp)60-180 s/i.75-80Peaty ¼"See Banana
Pachypodium (tp)30-180 s/iL65-75Well-drainedSS.
Pansy (hp)14-21 s/iD65-75Well-drained 1/16"#3 for 2 weeks.
Papaver (hp)10-30D55 Well-drainedSSBest sown IS.
Papaver Orientale (hp)10-30L55 Well-drainedSSBest sown IS.
Paradisea (hp)30-180 s/i.50Well-drained 1/16"See Bonsai
Parochetus (hp)30-90 s/i.50Well-drained 1/16"#2.
Parnassia (hp)30-180 s/i.55-65Peaty SSSoil must be kept moist. Stand container in water.
Parthenocissus (h/sh)60-180 s/iL60-70 Well-drainedJC#2, then #3 for 6 weeks.
Passiflora (hhp)30-365 s/i.70-85Peaty ¼"#2. Occasionally soak seed container.
Paulownia (ht)30-60L55-70Peaty SSSee Begonia
Pavonia (tsh)30-60 s/i.75Peaty 1/16".
Peanuts (ta)7-21.70-75Peaty ¼"Place seed container inside a plastic bag until germination occurs.
Peltiphyllum (hp)30-90 s/iL55-60Peaty SSStand seed container in saucer of water. Keep soil constantly moist.
Penstemon (hp)18-21L55-60Well-drained JCBenefits from #3.
Pentas (tp)25-40.70-75Peaty SSSee Begonia
Peperomia (tp)15-30.70-75Peaty SSSee Begonia
Perilla (hha)15-30L65-75Peaty SS.
Petrea (tsh)30-60L65-75Peaty SS.
Petunia (hha)10-21L70-75Peaty SSF1 hybrids and doubles may require 80ºF
to germinate.
Phacelia (ha)12-30D55-65Well-drained ¼"Best sown IS.
Phaeomeria (tp)30-90 s/i.80Well-drained 1/8".
Phaseolus (tp)30-60.65-70Well-drained 1/16"#1, then #2.
Philadelphus (hsh)30-60.65-70Well-drained JC.
Philodendron (ghs-p)30-120 s/i.75-80Peaty 1/16".
Phlomis (hp)14-45.60Well-drained JC.
Phlomis (hsh)30-90 s/i.65-75Well-drained JC.
Phlox (hha)10-21D55-65Peaty 1/16"Resents transplanting. Sow direct in pots.
Phlox (hp)25-30 s/iD70 Peaty1/16"#3 for 4 weeks.
Phormium (hp)30-180 s/i.60-65Peaty JC.
Phuopsis (hp)30-40L50-60Well-drained SS.
Phygelius (hp)10-14.70-75Well-drained JC.
Phyllodoce (hsh)30-60L55-65Peaty SS.
Physalis (hp)21-30L70 Well-drainedSS.
Physostegia (hp)21-30.55-75Peaty JCReduce temp at night.
Phyteuma (hp)30-90 s/i.55-65Well-drained JCSee Bonsai
Phytolacca (hp)30-60 s/i.65-70Well-drained 1/8".
Picea (ht)30-60 s/iL55 Well-drainedSS#3 for 3 weeks.
Pieris (hsh)30-70 s/iL65-70Acid peat SSSee Begonia
Pilea (tp)14-60 s/iL65-75Peaty SSSee Begonia
Pinguicula (hhp)30-120 s/iL55 PeatySSUse ½ peat and ½ sand. Also: See Begonia
Pinus (ht)30-60 s/iL55-65Well-drained SS#2, then #3 for 6 weeks.
Pittosporum (hhsh)30-60.55Well-drained 1/16"Place seeds in bag and dip in boiling water for 3 to 5 seconds.
Platycodon (hp)15-30L70 Well-drainedSS.
Platystemon (ha)14-30.55-65Well-drained 1/16"Best sown IS.
Plumbago (tp)25-30.70Well-drained JC.
Plumeria (tp)30-180 s/i.65-75Peaty 1/16"#2.
Podolepis (hha)21-30L65-70Well-drained SS.
Podophyllum (hp)30-180 s/iL55-60Peaty JC#3 for 3 weeks. Keep soil consistently moist.
Polemonium (hp)20-25.70Peaty 1/16"Reduce temp at night.
Polygala (hsh)30-60L60-65Well-drained JC.
Polygonatum (hp)30-550 s/i.50 Well-drained1/16"See Bonsai
Polygonum (hha,hp)21-60 s/i.70-75Peaty 1/16"Do not overwater.
Portulaca (hha)14-21L70-85Well-drained SS.
Potentilla (hp)14-30.65-70Well-drained JC.
Poterium (hp)30-60 s/i.50Well-drained JCSee Bonsai
Primula (ghs)20-25L55-60Peaty SS.
Primula (hp)21-40 s/iL60-65Peaty SS#3 for 3 weeks.
Primula Sinensis20-25D55-60Peaty SSCover container, keep in dark place and check for germination.
Proboscidia (hha)15-45 s/i.70-75Peaty ¼".
Protea (hht)30-90 s/i.65-75Peaty ¼"Use fresh seed, or sow immediately upon receipt.
Prunella (hp)30-60.55-65Well-drained 1/16".
Prunus (ht)120-365 s/iL65-75Well-drained 1/16"#2 overnight, then #3 for 4 months.
Pseudotsuga (ht)30-180 s/iL65-75Peaty SS#3 for 8 weeks.
Psidium (tsh)30-60 s/i.70-75Peaty JC#2.
Ptelia (hsh, ht)80-120 s/i.55-60Well-drained 1/8"#3 for 3 weeks.
Pulmonaria (hp)30-45.60-65Peaty JC.
Pulsatilla (hp)30-180 s/i.60-70Well-drained JCTrim 'tails' off seeds before sowing.
Also: See Bonsai
Punica (hhsh)30-45L70-75Well-drained SS#2.
Pyrola (hsh)30-90 s/iL55 PeatySS.
Pyracantha (hsh)40-180 s/iL50 PeatyJC#3 for 6 weeks.
Pyrethum (hha,hp)30-60 s/i.55Well-drained JCDouble flowers may not increase till 2nd year.

© 2001 by Ernestina Parziale