Can you retouch and edit these flower stock photos?

Yes. The licence permits editing without restriction for any use it otherwise allows. Crop it, flip it, recolour it, cut it out, composite it into something unrecognisable. Derivative work is expected rather than tolerated.

The two limits

They are the same two that apply to the unedited file.

You may not distribute the edited image as an image. Heavy editing does not create a new file you are free to license onward; a recoloured photograph placed in a template pack is still the file being sold.

You may not edit the image into a use the licence forbids, and you may not edit it in a way that misrepresents a real, identifiable place or person.

Technical notes for botanical work

Cut-outs. Petal edges and fine stamens are where automatic selection tools fail. Work at full resolution, refine the edge with a small radius, and check the result against a mid-grey background rather than white; fringing that is invisible on white is obvious on a coloured layout.

Recolouring. Selective hue shifts on a saturated flower will clip fast. If you are pushing a red toward magenta, work in a wide space, do the shift, and convert to sRGB last. Doing it in sRGB throughout flattens the petal into a single tone.

Retouching blemishes. Real plants have insect damage, brown edges and dust, and the catalogue does not silently remove them. Frequency separation handles the common cases without erasing the texture that makes the photograph look like a photograph.

Sharpening. Sharpen at the output size, not before. Botanical detail sharpened at full resolution and then downsampled for the web produces halos on every leaf edge.

Compositing several images

Nothing stops you buying three photographs and building one arrangement from them. Two practical warnings. Match the light direction before you match the colour; a bloom lit from the left dropped next to one lit from the right reads as wrong long before anyone works out why. And check the scale against the botany, because a daisy the size of a peony is the sort of thing a horticultural audience notices immediately.

Keeping your work reproducible

Save the layered file, not just the flattened export, and record the asset ids of every photograph in it. A composite built from four licensed images is four licences, and the record of which four is worth keeping.

Working from the preview first

Comp the layout with the watermarked preview before you buy. The previews are served at seven widths up to the full size of the original, so you can drop one into a real layout at real dimensions and see whether the crop works, whether the stem runs off the edge, and whether the colour sits with your palette.

Only then buy the file. It is a hundred dollars and the mark is there precisely so that this step costs nothing.