I believe that God prays in us and through us, whether we are praying or not (and whether we believe in God or not). So, any prayer on my part is a conscious response to what God is already doing in my life.
Gardening can provide an opportunity to slow down, be still, breathe, and connect with another form of life. For me, it is an experience of communion; I become one with this precious life in my garden, and it heightens my experience of love in the world. And that is what spirituality is all about: growing in love.