Enchanted Soil

Enchanted Soil is a block added by Botania. When a Mana generating flower is placed on it, it will work twice as fast. It is created by right-clicking an Overgrowth Seed on a Grass Block.

Once placed, the Enchanted Soil cannot be moved; attempting to harvest it even with Silk Touch causes it to drop as a Dirt block.

Legacy version
In several prior versions, Enchanted Soil would prevent passive Mana generating flowers from decaying. (R1.7 222 patch notes.) Judging by the notes, the author seems to have wavered as to what effect Enchanted Soil should actually have. Since then, however, it has been altered to simply speed up the effect of flowers planted on its tiles. This coincides with the removal of Daybloom and Nightshade in the latest releases.