Why does Krishna refer to two different seasons as his opulences in Gita 10.35?

What does Lord Krsna mean when He says “maasaanaam maarga shirshoham”?” We know that  maarga shirsha month corresponds to hemanta rtu. What I would like to know is about the specialty of the month of  maargashirsha in comparison to the other months and what makes it the best of all?

At the same time Lord Krsna also says “rtunaam kusumaakarah” which refers to vasanta rtu. So I was wondering on what philosophical basis can we understand Lord Krsna’s words that on one hand hemanta rtu is  the best and on the other hand vasant rtu is the best.