Teachers are always looking for ideas that will keep students’ minds busy and interested. Let’s face it. A busy mind has less time to get in trouble and tends to stay on task better. Greenhouses can be a very effective tool. A greenhouse is an unlimited source for experiments. Whether we are discussing math experiments or science experiments the possibilities are endless. build a greenhouse Standardizing testing focuses more on critical thinking today than it did in the past. Greenhouse experiments and investigations are naturals for critical thinking development. Plants offer a great fund raiser in the spring when parents are getting ready for summer gardens, whether vegetables or flowers.