Assuming the same principles of competition and selection are in play, and that plants evolved, there should be various obvious analogues between Earth and Xeno plant life (plant being defined as sessile phototrophic organisms). The exact details – the shape, colour, structure – will depend on local circumstances.
On Earth, leaf morphology correlates with water and light availability, because various shapes when combined in overlapping clusters are optimized for catching light. The shape of the leaf also determines how much light reaches leaves below and at what distance that penetration reaches zero. (You may have heard of Planet Furhaha, a worldbuilding ecology project; here is the study the author did looking at light penetration and leaf shape.)
Colouration of xeno-analogue photosynthesizers will be determined by available wavelengths from the star and absorption by the atmosphere.
Extraterrestrial photosynthetic plant-type life may look quite look
different in color because they will have evolved their own pigments
based on the colors of light reaching their surfaces. Nancy Kiang of
NASA's Goddard Institute for Space Sciences has modelled the light
reaching the surfaces of Earth-sized worlds orbiting their host stars
at distances hospitable to Earth-type life, where liquid water could
exist on a planetary surface, where depending on the star's brightness
(and color) and the planet's atmosphere. Kiang found that "plants" on
Earth-like planets orbiting stars somewhat brighter and bluer than the
Sun might look yellow or orange, and even look bluish by reflecting a
dangerous overabundance of more energetic blue light. On the other
hand, plants on planets orbiting stars much fainter and redder than
the Sun might look black. (Source; referencing this.)
And it's reasonable to expect similar growth strategies would be used: grow up and/or grow out. Plants can avoid being shaded out by competition, to the point of stifling the growth of competitors, by growing taller or wider (or both).