No. They are not gardeners. Rather earthworkers with a mini excavator and cement mixer. For planting, you could hire gardeners if you are willing to open your wallet for service providers. If you want it cheap, you can again hire the landscape gardener who offers this as an additional service.
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Thank God we are in Germany and everything is precisely regulated.
for those who think it's too long: "Landscape gardeners build and maintain outdoor facilities such as gardens and parks, sports and playgrounds as well as recreational facilities. They work creatively with plants, stones, wood and water."
What does one do in this profession?
Gardeners specializing in gardening and landscaping design, for example, gardens and parks by professionally planting lawns, trees, bushes, perennials and flowers. They create all kinds of outdoor facilities, from home gardens, terraces and parks to playgrounds and sports fields to traffic islands, and undertake greening along roads and in pedestrian zones.
They also pave the paths and squares of the respective facilities, build stairs, dry stone walls, fences and noise barriers. Furthermore, they green roofs or facades. They contribute to environmental and nature conservation by recultivating landfills or gravel pits.
Source: BERUFENET — Status: 01.08.2019