The Romaritime Flower is a Genshin Impact local specialty native to Fontaine, and an Ascension material for Freminet and possibly other Fontaine characters in the future. A squishy-looking aquatic plant with water-absorbent properties, you can find it on both land and sea. I highly recommend harvesting it whenever you encounter it in the wild, as there aren't enough to fully Ascend a character in one day.
Where to Farm Romaritime Flower in Genshin Impact
The Romaritime Flower is an abundant resource in Fontaine, but there isn't enough to Ascend a character in one day. If you run out of these flowers in your World, I recommend going to a friend's World through Co-op mode, then asking them if you could harvest some.
Reference the image above for all the Romaritime Flowers you can find throughout Fontaine's underwater area.
Above Ground - Court of Fontaine
Reference the image above for all the Romaritime Flowers you can find around the vicinity of the Court of Fontaine. They're strategically located near Teleport Waypoints, so I recommend farming there.
Above Ground - Beryl Region
Reference the image above for all the Romaritime Flowers you can find in the Beryl Region. They're also located near Teleport Waypoints, so they're easy to farm.
Above Ground - Romaritime Harbor
The Romaritime Harbor will naturally house flowers with the same name, but they're scattered around the small islets surrounding the region. You need to ride a Waverider to reach these areas, so it's not really worth the effort.
How to Farm Romaritime Flower in Genshin Impact
The Romaritime Flower only blooms when it's exposed to water, so you can easily harvest them while exploring the underwater regions.
However, when farming on land, you'll notice the Romaritime Flowers aren't blooming and you can't interact with them. You must first apply Hydro to the flowers to force them to bloom; they become harvestable immediately after.
To find more underwater materials in Fontaine, check out our guide on All Beryl Conch Locations in Genshin Impact here on Pro Game Guides.