Any successes and failures will be in the details, and although I truly believe there is some merit to children learning outside, in plant conservatories, etc. Light, air movement, the smells of nature, even being barefoot outdoors has health benefits and can actually raise your IQ. You can't have children learning "fluff", primarily because as an educator, your time is limited, but rather real-world life skills and knowledge that can integrate with the arts and sciences that they will need later on in life in the working world.
I am 56 and still learning new things every day about nature and the "grand design". For example, did you know that plants can communicate with each other through their roots and leaves? Did you know they can make ultrasonic "clicking" and "screaming" sounds when they are under stress, injury, attack, etc, and plants nearby will respond with biochemical defense mechanisms? Did you know they can communicate with each other by releasing chemicals into the air that are sensed by other plants? Did you know they can share nutrients with each other? There is so much more, but teaching children about the natural world, as well as, real-world applications of that knowledge seems to be lacking. So many children get bored, "Why do I have to learn this?" "I'm never going to use this." and then we loose them.