If you were gardening in a dream, then such dream indicates the hard work and things you will obtain. If you felt positively good while gardening, then such dream denotes to your great achievements and pleasure you have while working in your waking life.
Dream dictionary: Gardening dream meanings
If the ground looks spongy, then its a good omen of wealth, but if the ground seems unproductive, then its a warning that there will be difficulties and that there will be a great effort required in order to achieve successful projects. Other authors consider that gardening work represents sexual desires and repressions in this field.