How to grow a Rainbow Rose, Naturally. In 2004, two dutch companies, River Flowers and F.J.
Zandbergen, experimented and successfully grew a rose that had its petals rainbow colored. As petals get their nourishment through stem, the idea is to split the stem into several channels and dip each one in a different colored water. Top 10 Most Dangerous Plants in the World. 1. Most likely to eat a rat Giant Pitcher Plant: Nepenthes attenboroughii. Living Moss Carpet Adds a Touch of Green to Your Bathroom.