If you want to create reflection, like I have in the photo below, place your flower on a smartphone or tablet. As you are using black glass it will take in all of the light and give you a clear reflection.
Then, to bring out the reflection even more, brush over the flower's refection with the Dodge Tool to brighten it. Try and use a small, soft brush at the edges, so that you hardly touch the black. If you brighten the black surface, you'll be able to see what you've done.
It may even be better to take a bit longer to select the reflection accurately before brightening it. I would recommend doing this with the Magnetic Lasso tool.
One of the most important factors to help flowers stand out is make sure they're colourful. As a rule of thumb, you should never take flower photos in black and white, but occationally you'll find it works, like the photo below.
Flowers already usually have a nice colour to them, so you don't need to go overboard with boosting it. Go on to Hue/Saturation and increase the Saturation to +15 at the most. Also, play around with the Hue dial, to see if it improves the flower's colour. Though, keep between -15 and +15.
The reason for having such strict limitations with Hue/Saturation is because changing them dramatically will ruin the quality of your photo because you're changing all of the pixels in the photo. Also, when you manipulate a JPEG photo dramatically in Photoshop, you lose the quality in the whole photo.
Another way to increase the saturation of a flower photo is to change your Picture Style on your camera, which may be called something else if you don't use Canon. This is where you go into the camera's menu and choose a preset Picture Style that increases the saturation of the photos you take. If you don't like the settings of the presets, you can change them. (If you're not sure how to do this, refer to your camera's manual.)
Another way to make your flower photos pop is to actually make the flower pop out from the background. The easy way to do this is using a Vignette. If you use Lightroom or Bridge, you have a Vignette dial already there, just make sure you feather it to the maximum setting to make it subtle, yet effective.
If you're using Photoshop, here are the steps to creating a vignette from scratch:
1. Open up your photo and unlock your Background layer.
2. Use the Elliptical Marque Tool to create a circle/oval around your flower, making it a big bigger than the flower.
3. Then go to Select > Feather and set feather to 250px. Then do the same again.
4. The, inverse the selection by right-clicking inside the selection and clicking 'Select Inverse'.
5. Then duplicate the selected part of your layer by right-clicking the layer and clicking 'Duplicate Layer'.
6. Finally, use Curves or Level (Image > Adjustments) to make your new layer darker, making the flower stand out.
A little tip for you here would be, do not to go overboard. If you make a big change on a photo when editing it, it becomes noticeable that it's been manipulated. It's better to make lots of small changes rather than a few big changes.
That's it for my tips on flower photography, and it's more than enough. All you have to do now is go out and keep shooting, using these new tips. And of course, remember to show me your photos on Twitter with @gmcGareth or Facebook with Gareth Willey Photography.