Not with the aura, but there is a spell for that.
Prepare the plant in it's own temple, where it recieves the appropriate amount of Light.
Invoke the great spirit of Miracle Grow. Follow the instructions.
Make blessings of Water, and your time, to the plant.
Most importantly, focus your energy on the plant. Tell it you care about it. Tell it you want it to get better. Tell it you live it, and MEAN IT. Do this daily.
'Every intentional act is a Magical Act.'- Aleister Crowley, Magic in Theory and Practice