1. green up - Noun
2. green up - Verb
Of vegetation, to put forth new growth.
Of an landscape, region, etc., to become green as a result of seasonal vegetation growth.
green-up (countable and uncountable, plural green-ups)
New growth of vegetation, especially in response to seasonal weather changes.
green-up
Once some lakes begin to "green-up," it will help cut down the amount of sunlight penetrating into the water and allows fish to feed more effectively during the day. Source: Internet
With more favorable fuel conditions occurring as Michigan moves toward the green-up of vegetation where plants and trees are leafing out and filled with sap, fire potential can now be regulated based on local fire danger ratings. Source: Internet