I think the only standard ones are
DS - - - direct sow
HP - - - hardy perennial
HHP - - - half-hardy perennial
TP - - - tender perennial to tropical
P/A - - -perennial grown as annual (always a challenge to me!)
"WS" for winter sow.
I love one "germination database" that is no longer posted online, and called 'out of print". Here are some abbreviations they used, and each category also has a "usual time to sow".
It started at Thompson & Morgan, then went to "Virtual Seeds" .
I wish we had tabs or columns!
HA - - - Hardy Annual Late winter/early spring.
HHA - - - Half Hardy Annual Early/ late spring. Normally 4-8 weeks before planting outside.
GBb - - - Greenhouse Bulb
GP - - - Greenhouse Perennial - - - Anytime of year.
GSh - - - Greenhouse Shrub
GT - - - Greenhouse Tree
HP - - - Hardy Perennial - - - - - - Late winter/late spring and late summer/autumn.
HHP - - - Half Hardy Perennial - - - Late winter/spring.
HBb - - - Hardy Bulb - - - - - - - - Late winter/late spring and late summer/autumn
HHBB - Half Hardy Bulb - - - - - Late winter/spring.
HB - - - Hardy Biennal - - - - - - - Late spring/early summer.
HHB - - - Half Hardy Biennal - - - Summer/autumn.
HSh - - - Hardy Shrub - - - - - - Winter/late spring and late summer/autumn.
HHSh- - Half Hardy Shrub - - - Any time of year.
HT - - - - - Hardy Tree - - -- - - Winter/late spring and late summer/autumn.
HHT - - - Half Hardy Tree - - - Any time of year.
I don't know about trying to standardize: in the software business, it means "why don't you-all do it my way?"
