Blood Root Bulb

You sew the seeds of bloodroots using a combination of magic and blood. By expending a hit die, you can cultivate an amount of seeds equal to your spellcasting modifier. If a hit die is not spent, the spell fails. A creature that consumes this bulb heals for one roll of the hit die spent plus your spellcasting modifier, but if a creature (other than a vampire) consumes at least two bulbs in the space of 24hrs, they must make a constitution saving throw against your spell save DC or become poisoned for an hour, wherein they can repeat the saving throw until they succeed. 

At Higher Levels : If you wish to cast this at a 2nd level or higher, you must expend an amount of hit die equal to the level you are casting it, and the healing done is equal to the number of hit die you expended plus your spellcasting modifier.