Time on Frog Island

This is one of the six Shrub-seeing Achievements related to bringing the plant to certain locations on the island. There are 5 for certain locations and a 6th for having brought your plant to all 5 locations in a single playthrough.

This specific achievement can be done as soon as you start the game, though in my video below I wait to do all of the Shrub-seeing Achievements together on Day 8 of my first playthrough.

For this achievement, we need to carry it to the up a hill on the Eastern Island to where we can collect a purple gem. Obviously, this will depend on where you have placed the plant, but most likely it will be at the boat campsite, so head East from the camp along the beach, crossing two small rivers and finding a gate with a light purple color to it. Keep following the beach past it to come to a Bench near another campfire. Follow the beach North now until it turns East. There's a sign pointing across the water, and a hidden sandbar that will allow you to walk to the East Island. Walk across the sandbar and keep walking that direction when you reach the East Island to come to 2 flowers. The flowers will depend on if its Sunny or Rainy, but they will either be a Sunflower or a Rainflower. Descriptive, I know.

From these two flowers, head East through the trees and you should see a beehive on a tree to the North. Follow the path to the North by the beehive. This path winds through some pink flowers and at the top of the hill, you will unlock your achievement.

If you prefer to watch a video, start the video below at 1:44:50 to see where you need to bring the plant. Note that I had to make a small edit so I'm already heading East from the campsite with the plant at that timestamp.