This research examined the ways in which children observe flowering plants, namely: which features they perceive as significant, whether the skill of observing flowering plants develops with age, and what is the difference between genders. The research involved 174 children: 89 children aged 5 and 85 children aged 10 who were given the task of choosing the plant they recognised as the same as each of the 10 given test plants among a total of 37 plants which looked more or less similar to the test plants. The analysis of the plant combinations the children most frequently mismatched showed, that colour is the feature to which they attribute the most importance. Shape turned out to be considered more important to the children than size. Older children revealed better plant observation skills than younger ones with the girls achieving better results than the boys in both age groups. The findings show that children's observation skills develop with age, and corroborate the need to support the development of observation in the educational process.