Planting wildflowers along the highway, covering the middle and sides with colour, possibly fragrance, and something that does not need to be mowed, sounds like a great idea. I thought so too. Until I thought more about it.

Wildflowers will attract more insects, small animals and bigger animals to the busiest roads which will not be good for their continued health. Between animals becoming roadkill and people trying not to hit them, it could be dangerous for both.

Seeds from some will create havoc when they blow around. Others cause allergies for people which will be distracting for drivers.

Also, just because they do not need to be mowed, does not mean there is no maintenance at all. People would have to go along a lot of highway to keep plants from growing into the road ways. That would not be free: gas, wages, vehicles and maintenance of vehicles, equipment... Probably other things I haven't thought of yet.

You may think all that unused land could even grow something useful, harvestable even. Herbs could work better than wildflowers. But, still have some of the same issues.

Any plants chosen to grow this way would need to be hardy, drought resistant, grow over spring, summer, and fall (not be dormant and leave bare ground for most of the year - which would give space for all those so called weeds to re-seed and not look pretty), not grow very tall or spread too much. This is probably one reason plants we call weeds are left to grow along the highways.

I love the idea, but it isn't as simple as it seems.