Wild species guidelines

 Species Mating SystemDaylength ResponseSowing (Davis) FloweringPollination MethodPlants / generPlants / potNotes
S. lycopersicum  var. cerasiformeselfing (SC)day neutralFebruary - Aprilyear roundOP6-9(field) 
S. pimpinellifoliumfacultative (SC) popsmostly day neutralFebruaryyear roundmass sib755Facultative accessions are grown in greenhouse to prevent outcrossing.
S. pimpinellifoliumselfing (SC) popsday neutralAprilyear roundOP6-9(field) 
S. cheesmaniae,
S. galapagense
selfing (SC)short dayNovemberFall/Winter/Springself12-152Slow growing; long days suppress flowering.
S. chmielewskiifacultative (SC)day neutralMayyear roundmass sib755 
S. neorickiiselfing (SC)day neutralMayyear roundmass sib155 
S. arcanummostly SI, some SCday neutralJuneyear roundmass sib755 

S. peruvianum,

S. corneliomulleri,

S. huaylasense

outcrossing (SI) or

mixed (SI & SC)

day neutral, some short dayJunemostly year roundmass sib755 
S. chilenseoutcrossing (SI)short dayJulyFall/Winter/Springmass sib753-5Water sparingly.

S. habrochaites


outcrossing (SI) popsshort day



Fall/Winter/Springmass sib753Forms edema on leaves under high humidity.
S. habrochaitesfacultative (SC) popsshort dayJulyFall/Winter/Springmass sib50-753Southern SC pops more daylength sensitive.
S. pennelliioutcrossing (SI) or mixed (SC/SI)day neutralJuneyear roundmass sib755Use well-drained soil and water sparingly.
S. lycopersicoidesoutcrossing (SI)short dayAugustFall/Winter/Springmass sib753Up to 6 months fruit ripening
S. sitiensoutcrossing (SI)short day or day neutralAugustyear roundmass sib753Up to 6 months fruit ripening.  Water sparingly or graft onto hybrid rootstock.
S. juglandifoliumoutcrossing (SI)short dayAugustFall/Winter/Springmass sib7536-8 months fruit ripening.
S. ochranthumoutcrossing (SI)short dayAugustFall/Winter/Springmass sib7536-8 months fruit ripening. 


SC=self-compatible, SI=self-incompatible

Suggested planting times are based on each species' photoperiod preferences, as well as space and workflow criteria specific to the TGRC, and can be modified as needed. Some groups, e.g. S. lycopersicum, chmielewskii, neorickii and pimpinellifolium, thrive at almost any time of year.

OP=open pollinated under field conditions (i.e. mostly selfing); mass sib = cross pollination of all plants in a population using a bulk pollen sample.

The number of plants grown in each seed multiplication cycle are based on the TGRC's goal of maintaining genetic diversity and are provided for information only.

The suggested numbers of plants per pot (ca. 2L vol) are designed to promote flowering and limit vegetative growth by crowding plants.

S. habrochaites
S. habrochaites plants in the greenhouse. [photo R.T. Chetelat]
S. juglandifolium
S. juglandifolium plants with fruit. [photo R.T. Chetelat]
S. pennellii LA2719 plants
S. pennellii LA2719 starting to flower. [photo R.T. Chetelat]
Fruit set on S. corneliomulleri
Fruit set on S. corneliomulleri in greenhouse. [photo C.M. Rick]