Flower

Hidden green flowers
Search the following locations to find the hidden green flowers:

Yellow Flower stage

Bloom all white flowers in the first area to find a green flower.

Bloom all white flowers in the second area to find a green flower.

Search behind a rock on the rear of the tree at the end to find a green flower.

Red Flower stage

Bloom all flowers before going through the stone wall, and a green flower will appear.

After the rock wall opens, bloom all the red flowers in that area, then all the yellow flowers. A green flower will appear on a sort of rocky outcropping.

Enter the last area with the three formations surrounding the larger center one. Do not follow the blue flowers. Instead, go left around the edge of the canyon. Go past the blue flowers, look towards the mountain, and follow the path going up the mountain to find a green flower.

Pink Flower stage

Bloom all flowers in the starting area to find a green flower.

Stay to the left in the canyon, and enter the cave. Keep to the left to find a green flower.

After the canyon ends and before you enter the field, turn around to find a green flower.

Blue Flower stage

Look behind the two hay bales in the distance to find a green flower.

When charged, circle around the wagon to find a green flower.

When charged, fly over the lit pond. A green flower will appear next to the pond.

Purple Flower stage

Turn around when the stage begins, and go over the hill to find a green flower.

At the field with the towers, look for the two near the back that are leaning over slightly. Bloom the white flowers under them to topple the towers. After both have fallen over, a green flower will appear.

Turn around at the end of the maze when you see the pink speed flowers. Travel back in the opposite direction to find a green flower at the end of this path.

White Flower stage

Find the two tallest buildings in the first main city area, then fly through the door of the one that is facing your right when entering that area. Go up to find a green flower on a rafter.

Take the ramp on the far right when the highway splits into three ramps to enter a garage with a green flower.

Immediately after leaving the highway, you will be in an alley with pylons. Look behind the farther air conditioning unit as the area opens up to find a green flower.

Easy "flOw" trophy
In the Pink Flower stage, stay to the left in the canyon, and enter the cave. Keep to the right to get the trophy.

Easy "Illuminator" trophy
In the Blue Flower stage, when charged, fly over the darker pond.

Trophies
Successfully complete one of the following tasks to get a trophy:

Memories (Bronze): Reminisce for three minutes before returning to the room.
Palette (Bronze): Use the grass as your canvas and paint the ground with three different colors.
Wind (Bronze): Play with the windmills and ride the wind seven times.
Illumination (Bronze): Light a darkened pool.
Pure (Bronze): Journey to the city unscathed.
Stars (Bronze): Release all of the names to the sky.
flOw (Bronze): Life could be simple...
Nature (Silver): Bloom 10,000 flowers.
Urban (Silver): Completely awaken the city.
Dream (Gold): Beyond all flowers lies another room.
Additionally, there are four secret trophies:

Welcome Back (Bronze): Play the game after a week-long break.
Healthy Play (Bronze): Take a ten minute break between any dreams.
Beginning (Bronze): The dream has just started...
Discovery (Bronze): Find and bloom a secret flower.