I have a soil plant farm close to the surface growing all types of plants (except for Deathweed, because I don't want to deal with corruption). All the plants are maturing and blooming fine except for Fireblossoms – all Fireblossoms I've planted so far have failed to grow past the sprout stage. What could cause them to fail to grow?
Note that I'm not talking about blooming, which I know requires lava in the case of Fireblossoms, but the plant maturing to the point where it is able to bloom.
Best Answer
Fireblossom must be planted in either ash or a clay pot. You say "a soil plant farm", but I don't know if you used dirt or ash for the Fireblossoms. It won't grow in dirt (Fluttershy's comment is correct).
Also, it may be that Fireblossom only grows on Ash in the underworld. The wiki article on Fireblossom Seeds suggests only potted Fireblossom will grow anywhere.