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Shows tropical bedding in smaller areas with concrete directly adjacent; potted accent plants are a good idea flanking the main entrance of your building.
This illustrates lower tropical options and a water element on one side - you could consider a bubbler ceramic pot on one side for the calming sound effect as well as the look (not like this tiered fountain, but similar idea).
At the foremost right is a Rhodea which I love to use - a little fluffy, a little ruffly and tropical but compact and a clean look.
Depending on your color preferences, you can combine a tropical look with seasonal flowers that will change out and keep your look fresh year round. This example is a little too busy but gives a general idea.
There are several types of ferns that look fabulous installed as groundcover - your shaded entrance location allows an opportunity to consider using soft ferns with a larger ornamental element (small flowering tree (such as a camellia or small palm).
Another unique idea that could work for your entrance are flanking pots with flowering vines wither trained to go up the entrance columns or spilling out of the pots below a higher more vertical element. This image shows just the presence of a bouganvilla or similar (your application would be on a smaller scale).
This image shows white Peace Lilies planted in the ground (which many people don't consider but that offers a clean, flowering mass). Calla lilies can be used in the same way.
I am showing you this because it is disorganized and spotty. With every design, plants should be placed en masse and grouped so that they make sense to the viewer and define spaces. This is NOT what you want.
I am including this to get your reaction to the colored tropicals. I am generally not a proponent of adding the red-leaved plants, although I do very much like to use variegated gingers (will put another photo to illustrate).
This bedding design at left would be a great look for your entrance. Organized, a little color, soft. Of course you do not have enough space for such a large ornamental, but could add a small palm or legged-up camellia or even less expensive evergreen ligustrum that has been groomed to have a multi-trunked ornamental presence.
Borders or massing of this silvery burnnera or even caladiums can add texture and color while maintaining a clean, ordered look.
The center highest pot gives you a general idea of what a "pot garden" can add to an entrance. Several different things (that can be changed out seasonally by your maintenance crew) adds interest and keeps things fresh.
This is not a great photo, but this is the variegated ginger that I like to use en masse (for example as a mid-height element at the street-facing wall of your building). It makes a strong presence but can take many different growing conditions and if well planted, will keep a clean look.
Another example of tropical low bed massing - even at the foremost part a dwarf philodendron variety that is a great option to consider at your entrance. Caladiums offer seasonal color.
I am showing you this for the giant elephant ears (colocacia) - I generally don't love the dark ones, but the bright green ones can be added at the base of your trees (across from your entrance) and then surrounded by the fern groundcover and then further out, caladium bordering. Layering and massing are the keys to making an impact.
Now this photo is too too tropical for our area (to hold up well) but I want you to notice the massing of philodendron. This IS something that can work on your property and you may consider for the street-facing wall of the building and/or around your sign (along with higher palms or similar).
The two matching palms that Phoenix Landscaping has and can relocate are very similar to the ones you see here - about 15 feet high or so - they could be used at your sign and then surrounded with other massing plantings with uplighting to give a great look at night.
Very neat, ordered bedding with a mix of tropicals and more classic shrubs with seasonal color added. Note the ceramic pot at center left - this is the type of pot that I like to have made into a bubbler fountain.
This shot shows camellias that have been legged up and made into small ornamental trees. This is a great look for accent trees in bedding areas - they are evergreen and add color seasonally.
Another example of ferns as groundcover. Would totally work under your trees across from your entrance, surrounding the seating area you discussed. Very inviting.