The
Living Seed Calculator should answer that for you.
There's really no easy way of telling without it.
I for instance mostly raid-heal in 10-mans while rolling Lifebloom on the tank and occasionally fill in with direct heals. Regrowth on OoC, Swiftmends, sometimes Nourish to refresh LB or HT to cover a bigger health gap, the usual. And even for me Living Seed is more beneficial than Nature's Bounty or Blessing of the Grove according to the calculator. This is a choice that might not be always obvious. I also don't have Nature's Swiftness, I simply don't find the long cooldown worth the very minor healing boost.
In the end, you really need to tailor your talents to your play-style. This is because there are too many talents whose benefit depends on it and the calculator above can help show you that. If you mainly tank-heal, then you might not need Swift Rejuvenation, for example.