Besides learning the habitats which different plants favour, don't overlook visibility; particularly how this is affected by colour and lighting.
I try to land somewhere with the sun well above the horizon but not at zenith... So not near the terminator or the centre of the day hemisphere.
On finding a plant for the first time, examine it from different directions. Some will cast a long shadow. Others will be bright or colourful when lit face-on. Once you identify that, fly in the best direction to spot more.
Then there's night vision. Things like tussock and frutexa get highlighted well by it because of their multiple stems; frutexa sparkle more than tussocks. Look at a plant with and without night vision to decide which setting will make it stand out from rocks better.
On finding a bacterium, note its colour and remember to look for more only where the flat terrain is a different colour.
Note the appearance of a plant from different heights; don't fly too high or too fast and low.
Learn how far apart samples need to be. With some things like tussocks, conchoida or fungoida you can sample one, then walk to sample another without having to re-embark.
Use the SRV sparingly. I usually just walk or fly to the next sample. A small ship for landing in rough terrain is an advantage.
Strategize your landings. When landing to get the last of three scans for a plant type, try to arrange that a new unscanned type is also nearby so you get two scans at one location.
I often think that people who are disparaging of exobiology, saying it's boring, unskilled or overpaid, haven't really thought about it in this kind of depth. Sure, it's not twitchy like combat, but it rewards the kind of skill based on analysis and experience.