The caster touches a living plant or the earth itself and enchants all living flora within the area of effect to bioluminesce. If there are no living plants in the area, or the plants are disconnected (across a chasm, floating, etc.), the effect will not spread. The caster need not spread the light to all plants in the area, but the effect must spread from the caster. For example, the caster may light all plants in a cross around them, but may not cause plants 60 feet away to be lit without a path of lit plants there.
The spell effect will move with the caster in a glowing "carpet" of light, as the Area of Effect stays centered on the caster.
The spell can be dismissed while still within the area of it by touching a glowing plant. The effect will then fade out over a few minutes.
Once daylight reaches the enchanted plants, their magic fades away.