You can also go to the Swap Shop and download lots created by forum members. I have created some gardens that focus on specific aspects, a nectar and a chef's garden are a couple. I put in spawners for look and I know that one spawner has the purple, green swallowtail and the red butterfly, not sure about the zebra. As for the insects, I put out spawners for the rhino and the stag, or else the spotted, can't remember which ones.
Others have also created gardens that have spawners, if you don't mind using them. I don't know if you would see that as a form of cheating. I put in the butterfly and insect spawners for looks manily but they have come in handy when I am working on my elixers and can't find the insects I need elsewhere.
Others have also created gardens, Mrs. Flynn along with some others has created a couple of really nice gardens. Like I have, they are mainly for enjoyment, a place for sims to meet but also to collect some fruits, veggies and other items sims can need.
I hope it is okay to mention about the gardens in the Swap shop, if not, please let me know and I will delete this or the mods can delete it.