Of course, gardening has practical benefits in addition to these spiritual ones. You can pick and choose which plants you have in your garden; from vegetables and culinary herbs which you can use in the kitchen (*wink* to all you kitchen witches out there), aromatic plants which you can use to make your own aromatic oils, and basically any herb which you feel you can use in your rituals (sage for cleansing the circle, mint for making anointing oil and so on). The more energy and love you put into your plants, the better they will grow and the more quality they will prove to be when it's time to actually use them for a certain purpose. At least this is how it has been for me so far. :)
I find it very rewarding when I see a plant grow (be it from a seed or not) knowing that I helped it get to that stage. Still, what's even more rewarding is being able to actually use these plants. This is why I love medicinal and aromatic plants so much. In the past, I made chamomile tea, marigold ointment and a number of other herbal remedies from my own plants. I can't even begin to explain the pride I felt from this. And even if you prefer nice flowers over herbs, you can still use the flowers for you table centerpieces, give them as gifts or use them in DIY projects.
But no matter what plant you choose to grow, it's sure to bring you joy and pride if you take care of it.
Since this post wasn't so typical of me (it's more personal and less "practical" and objective), I have to recommend a few nice books and web-sites to stay true to my industrious nature. :) So here are a few reads which I find very useful for any Pagan that has a love for their garden. :D Enjoy!
Cunningham, Scott - The Complete Book of Incense Oils and Brews
Cunningham, Scott - Cunningham’s Encyclopedia of Magical Herbs
Hoffmann, David - Medical Herbalism Complete
Marcin, Marietta Marshall - The Complete Book of Herbal Teas
Martin, Deborah J. - Herbs: Medicinal, Magical, Marvelous!
Miller, Richard Alan - Magical and Ritual Uses of Common Herbs
Moore, Michael - Herb Formulas
Mrs Grieve - A Modern Herbal
Ward, Harold - Herbal Manual
Weil, Andrew - Guide to Herbal Medicines
Unknown - Herbs and Their Magical Properties
Pagan Path - "Witchcraft Gardening Basics"
Rain-tree - "Methods of Preparing Herbal Remedies"
And finally, here are the results of my mom's and my gardening work :)