I recently bought an Improved Meyer lemon tree. It is about 2.5 to 3 feet tall and has many tiny lemons on it. My gardener put it into the ground and it was doing well for a while. Last week, the tiny lemons started to turn yellow completely and dropped. The leaves have yellow tips and curled. Right now, only the larger lemons are still green and all the small ones are yellow. I live in San Jose (San Francisco Bay Area) and the plant has full sun all day. I watered it last Friday and today. Please please please help me as I am new to this and have no green thumbs.