This concept involves creating the impression of quality and experience in plants and garden accessories and also a smart place to communicate with other growers. The serif typeface give a sense of tradition and knowledge. Incorporating a leaf into the 'o' gives it a stylish, modern look and tying the word 'exchange' in underneath creates a smart, upmarket logo in a practical horizontal format. The colours I've chosen for high contrast and a strong modern look
I have presented the logo without your slogan as I feel the logo is quite complex and the slogan incorporated underneath makes it slightly 'busy'. I'd prefer to see the slogan on a web page separated slightly from this logo. This would emphasize both the logo and give more air for the slogan to stand out more.
I'll upload a version with the slogan also to show how it could work if need be.