First time poster. I'm looking for some advice around how to make my tropicals flourish and grow more than they have. I planted these Cana Lillies, some creeping myrtle? and 2 hosta in this little bed here along the retaining wall of our yard about 3-4 months ago. At first they were looking great and about a month and a half in they all started looking blah and the hostas and myrtle are dying. You can also see the bird of paradise is not doing well either. This area gets full sun about 5 hours a day. I've tried watering less and I've tried watering more. I amended the soil with good organic compost when I first planted and sprinkled a little osmocote in the soil. I've even tried liquid miracle grow every couple of weeks and still I notice this slow decline in health. It was mentioned once in this forum that the oak trees could maybe be a source of the issue, sapping nutrients from the soil but as you can see some of the plants around the area are doing fine. Any help is much appreciated.
Additionally, I'm wondering who would you contact if you just wanted a professional gardener or someone to come out and inspect the yard and give a plan of action?
Thank you!

Hi picklegarden,

You didn't mention where you live which would help in determining the ideal conditions for growing these "tropical" plants. It appears that all of these plants are growing in direct sun and the soil appears extremely dry, which could be the issue of why the plants don't seem to be thriving. I do see Cannas (Canna) in your photo which do very well in full sun. I don't see the plant I know as "Creeping Myrtle" Lesser Periwinkle (Vinca minor) or the plant I know as Bird of Paradise (Strelitzia reginae) in your photo. I also do not see any Hostas (Hosta) which by the way will fry if grown in full sun. Hosta is a shade loving plant.

It's a really pretty planter area and I'd suggest a thorough watering as well as adding mulch to help keep the ground cool and to conserve moisture.