Beautiful images can be captured by getting close to nature. The images below have been captured as you would expect, with a Macro (Micro in Nikon terminology) lens. With macro images you can freeze action using electronic flash, flash is very useful for macro photography as apertures of f/11 to f/16 are used to get satisfactory depth of field.
The Nikon Micro lens range enable you to get down to life size or a reproduction ratio of 1:1. If you want to get even closer you can use a Kenko extension tube.
Insects are a great source for close up images around your garden. In most gardens these subjects are abundant and generally you can get quite close to the subject.
There are quite a few Micro lenses to choose from in the Nikon range.
If you are using a DX camera then one of the cheaper lenses is the Nikon, Nikkor 85mm f/3.5G ED VR AF-S DX Micro Lens
For the FX cameras there is a nice selection as follows:
My favourite lens is the 200mm as it gives more working distance between the camera and the subject. Also the 105mm Micro lens is a great insect lens.