Evolution is about adaptation in response to environmental factors. Hence Alpine species of willow herbs are smaller than their relatives at lower elevations. The alpine species have the genes for larger size but those genes are redundant. The reason for redundant DNA is evolution.
Through evolution plants have developed defences. Some plants evolved stems that terminate at sharp points (Thorns) Others have evolved to have modified leaves (Spines) some cactus spines are evolutionary remnants of rigid petioles and midribs. Cacti have evolved to photosynthesise through their stems. Others have evolved short woody outgrowths (prickles) We can see how all these defence mechanisms evolved so it is hard for ‘creationists’ to kick against the pricks.
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