>>14417054You can merge them with any type of hermes boots (fished or underground chest) to make secon tier of hermes boots (spectral boots).
I cannot believe you've gone this far without Hermes boots, it's single most important accessory in the game without question, unless you are some crazy hook professional.
>>14417043It grows in hell, although while it's still growing, it looks rather small so it's easy to miss. Nevertheless, you should wait for it to grow to get seeds which then you can plant in dryad's planters.
Various plants bloom in different times, some only during day, some only during bloodmoon etc.
When they glow it means that you can harvest them and they will drop seeds, otherwise you will only get the flower.
https://terraria.fandom.com/wiki/Fireblossom 