I've recently completed the Gardening 101 quest in Free Realms, located in Shrouded Glade, and it took me a bit of time to work out a reliable strategy for the Garden Defense game - it can be easy for it all to go wrong after the first few waves. So here's my guide on how to succeed in Garden Defense: Gardening 101 - I hope it's helpful!


4. Complete the next cluster of a water gun and two dwarf towers and then level them all up to the next level as well.
5. Add a garden tower to the cluster and upgrade it, then repeat the same pattern yet again at the next curve to produce another upgraded group of a water gun, two dwarf towers and a garden tower.
6. Finally build yet another cluster on the right of the area, and upgrade the towers. You can then use any extra money to start upgrading some of your towers to the third level.

And there you go - Garden Defense: Gardening 101 is complete. This way you should complete the level easily and only need to use any of the attacking power ups on the last few waves. The money boost power up can be very useful in getting things built more quickly, so if you get any try and time them right so that as many enemies as possible are killed while the power up is active. Using some of the attacking power ups at the same time as the money boost can be a good way to achieve this.
The only thing this method doesn't do is complete the bonus goal of upgrading 3 cow towers. If you want to try and get this as well I'd recommend waiting until towards the end when your existing towers will already take care of most enemies fairly easily, then add in the cow towers and upgrade them.
