How do you make glasshouse in alchemy?

Walkthrough for greenhouse in Little Alchemy

1. earth + fire = lava.
2. air + water = rain.
3. earth + rain = plant.
4. air + lava = stone.
5. air + stone = sand.
6. fire + sand = glass.
7. glass + plant = greenhouse.

1. What is the hardest thing to make in little alchemy?
2. How do you make a fountain of youth in little alchemy?

What is the hardest thing to make in little alchemy?

The rarest item in Little Alchemy is The Doctor.

The Doctor requires 27 combinations to make, starting with Earth and Fire and eventually getting to Life, Moon, Human, and Time.

How do you make a fountain of youth in little alchemy?

How To Make Fountain of Youth - Fountain + Immortality.