Your wording is slightly confusing, but yes, the titania crop requires either a titanium ore (which doesn't generate with default GregTech configs, though for all I know, there could be some other mod that generates titanium ore by default) or a block of titanium below the farmland in order to reach full growth.
However, looking at the recipes:
384 seconds at 384 EU/t (2949120 EU total) to convert 16 titania leaves and 6 L UU-matter into 1 purified ilmenite ore in an autoclave
4 seconds at 300 EU/t (28800 EU total) to use 9 titania leaves and some water to multiply a crushed bauxite, ilmenite, or titanium ore into 4 matching purified ores in a chemical reactor
Most of which still require significant further processing to get titanium ingots, I'm not convinced titania is worth the effort of growing.