I like your use of vibrant color. Some thoughts . . .
In general, I would like to see the idea of "nurturing" be more powerful - possibly the use of vine, showing growth, fertile. The "nurturing" portion is the most important part of the service.
I will provide some specific feedback on each design that will hopefully help to create a new design . . .
Design
#7, I wonder if the orange background was in the shape of a house for greenhouse.
Design
#8, not sure i liked the word "green" in blue -- seemed to take away the emphasis. The word "greenhouse" is one word, so i would keep the treatment the same for the entire word, "greenhouse".
Design
#9, the color in this design did not appeal to me as much. I like the idea of seeds, but the graphic looked more like petals or leaves of a flower. This was probably my least favorite.
Design
#10, need an image that can stand alone, as opposed to having the text be the image.
Design
#11, does not convey the nurturing as much as I would like. I don't think I want the text in the graphic because as I shrink the logo down for different purposes, the text will be difficult to read.
Design
#12, this is a cool design with the idea of the bud emerging, but end benefit of the service is producing that ripe "tomato", which is a sales-ready lead.