fertilizer

Commercial plants are sometimes over-fertilized to give them that dark green appearance. The uninformed public thinks they look healthier which isn't necessarily true.

Other issues - light exposure for example - can lead to color differences as commercial growers grow plants very differently than the average home grower. Different varieties can also differ in leaf color.

Is it a problem? No, not if your home grown plants are sufficiently fed and appear healthy.

Dave

Thanks for the reply. I would be afraid to fertilize more because I put bone meal and kelp meal in the whole with all the plants. And the soil is very well composited. The purchased ones may have been in the sun more.