Gardeners struggle to know what plants will thrive in large cement planters with unknown drainage and soil conditions

Home gardeners and landscapers face uncertainty when inheriting or installing large cement planters, unsure which plants will survive given the planter's drainage properties, soil retention, temperature fluctuations, and root space constraints. Existing gardening advice is generic and doesn't account for the specific challenges of cement containers, leading to wasted plants, money, and time through trial-and-error planting.