My morning routine of checking the germinatrix revealed that all Arisaema seedlings (triphyllum, flavum and consanguineum) will be 1 month-old tomorrow (counting since sowing). Time goes by so fast!
I said it before but better to repeat – start Arisaema as early as you can, water plenty and they will have an extended season of growth (i.e. bigger tubers). This way, they can start flowering in the third year.
Note: all species mentioned are fast, warm germinators.