The first Groot Awakening challenge is your first step to earning the Rocket "Battle Brothers" emote. Fortnite season 4 (opens in new tab) is offering up a bunch of Marvel characters as skins in the battle pass (like Wolverine (opens in new tab) and She-Hulk (opens in new tab)), but to get their special emotes and superhero skins, you'll need to complete each character's Awakening Challenge.
For Groot's first challenge, you need to find where to plant a seed on a heart-shaped island. Here's exactly how to do that.
Heart-shaped island location
The heart-shaped island you need to visit is located on the west side of the Fortnite map, as highlighted in the map above with my camera icon.
Here's what the heart-shaped island actually looks like. It's not all that big, and it's easy to miss, but you'll find it among the other small islands/rocks on the coast west/southwest of Sweaty Sands.
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Once you're on the heart-shaped island, you should see an interact prompt at the center of that dirt circle. Interacting with it plants a seed, obviously.
As far as challenges go, this is a pretty simple one. Next up on the Groot Awakening Challenge list is to emote at a friendship monument.
Every Marvel character in the season 4 battle pass has their own Awakening Challenge list (opens in new tab). You can also find Baby Groot hidden on the Fortnite map (opens in new tab) and turn him into a rare back bling cosmetic item.
Epic also recently added the Panther's Prowl location, based on the incredibly popular Black Panther (opens in new tab), and fans have turned it into a memorial to pay tribute to the late actor Chadwick Boseman.