Seeds germinating at the optimum temperature for germination

Optimum Seed Germination Temperatures

Following on from the list of optimum seed germination temperatures for vegetables that we published recently, here’s a more general (very much) work-in-progress list to help you get growing…

Essentially, the list of germination temperatures featured on this page should be viewed as a guide only – your own mileage may vary, dependent on a whole host of factors, including climate, location, seed genetics, moisture levels and so forth. Notwithstanding that, it’s certainly always useful to prepare yourself with as much knowledge as possible before embarking on the attempted germination of a species you may not have grown before, and so we offer this resource in that spirit!

We’ll be updating this list as we have time to do so, but don’t forget that there is a lot more to encouraging the best possible seed germination rates than simply setting the right temperature! However, at least this concise chart should give you a head start on your way to growing your favourite species – whether purchased from our store or elsewhere.

As always, if you have anything useful to contribute, please do get in touch via the Contact page – we want to make this site the best resource possible, but can’t do that without a little help from you! Good luck with your germination experiments…

Temperatures for Optimum Seed Germination

Please note that all the temperatures – both Celsius (°C) and Fahrenheit (°F) – listed on this page are rounded to the nearest sensible whole number.

Acacia auriculiformis22–32°C / 72-90°F
Acacia baileyana20–25°C / 68-77°F
Acacia burkitti18-22°C / 64-72°F
Acacia confusa25°C / 77°F
Acacia longifolia19-21°C / 66-70°F
Acacia maidenii21–27°C / 70-80°F
Banisteriopsis caapi17-30°C / 63-86°F
Datura stramonium21-24°C / 70-75°F
Desmanthus illinoensis20°C / 68°F
Ephedra species20°C / 68°F
Lophophora williamsii20-30°C / 60-86°F
Mimosa hostilis20-25°C / 68-77°F
Phalaris arundinacea24-27°C / 75-80°F
Phalaris aquatica15-25°C / 59-77°F
Psychotria viridis32-35°C / 90-95°F
Silene capensis21-24°C / 70-75°F
Tribulus terrestris20–30°C / 60-86°F
Trichocereus species25–27°C / 77-80°F