The garden was very important to the Regency lady as part of her elegant surroundings, a way of displaying her taste and income. Having the latest plants, the most fashionable furnishings and statues and a range of interesting walks for her guests would all be of importance. I am not sure whether these two are a married couple or whether a little light flirtation is about to take place! (Le Beau Monde or Literary & Fashionable Magazine August 1807)
The formal garden close to the house was the place for ornamental plants, but anyone with an estate would also have pleasure grounds with shrubberies and woodland walks. Picnics could be held there and there is definitely some rather scandalous behaviour taking place in this detail from a print in the French Modes et Mannieres series.
If you could afford it you would have a gardener, of course, like this chap drawn by Pyne in his book of examples for aspiring amateur artists to include in their own compositions. Their employers, however, often developed an interest in hands-on gardening themselves - which probably was not very popular with the real workers!
And finally, also from Ackermann, here is a gorgeous outfit for strolling in the garden or posing on a Classically-inspired stone seat. I somehow don't think this lady is going to be potting up foxgloves in that outfit!