The Spiral Planter

The Spiral Planter - more than just a flower bed

Raised bed for the balcony or garden

Individual sizes


  • for herbs, flowers & smaller plants
  • indoor & outdoor
  • Width: 49 cm, Height: 64 cm
  • 26 planter shelves
  • 0.4m² growing area
  • 75 litres soil volume
  • for herbs, flowers & smaller plants

Medium & Large

  • for herbs, flowers & vegetables
  • large root space for deep-rooted plants
  • outdoor
  • for herbs, flowers & smaller plants
  • Width: 99 cm, Height: 102 cm
  • 20 planter shelves
  • 1,25m² growing area
  • 250 litres soil volume
  • for herbs, flowers & smaller plants
  • Width: 99 cm, Height: 123 cm
  • 26 planter shelves
  • 1,5m² growing area
  • 300 litres soil volume
A raised bed for eternity

Durable materials


Regional - that's clear!

Whether made of shiny stainless steel or in the trendy rust look of construction steel and corten steel, Urbanga only produces in Germany and uses durable materials that do not require any special care only.


Corten steel

Corten steel was invented for shipbuilding, because even in extreme weather conditions, the steel lasts for several decades. The special thing about corten steel: the top layer of rust forms a protective patina so that the steel does not rust through. A nice side effect: Corten is a natural snail deterrent and even keeps slugs away! The typical rusty colour develops with time and weathering. However, you can accelerate the rusting process so that your Spiral Planter develops an even rusty shade after just 7-14 days.

Spiral Planter Medium & Large:
Material thickness 3 mm, sandblasted, rounded edges

Spiral Planter Mini:
Material thickness 1.5 mm, rounded edges


Construction Steel

Made of high-quality and robust steel. Like Corten steel, construction steel will also start to rust due to weathering. Mild steel lasts a long time, but unlike Corten, it rusts steadily (about 1mm/10 years). To get the desired rust look as quickly as possible, you can pre-treat the steel with a rust accelerator .

Construction steel and Corten steel before the rusting process:


Spiral Planter Medium & Large:
Material thickness 3 mm, sandblasted, rounded edges

Spiral Planter Mini:
Material thickness 1.5 mm, rounded edges


Stainless steel

The most glamorous of the Spiral Planters is made of ground stainless steel. It retains its silvery hue and does not rust. The Spiral Planter made of stainless steel does not heat up quickly because the shiny material reflects the sunlight. The kit is delivered foiled to protect the noble surface during transport. Stainless steel is also one of the most weather-resistant materials and does not corrode. Our stainless steel raised bed will give you a lifetime of pleasure.

Spiral Planter Medium & Large:
Material thickness 3 mm, ground, rounded edges

Spiral Planter Mini:
Material thickness 1.5 mm, ground, rounded edges

From mediterranean to shade-loving plants

The right location for every plant

The plant zones


The most valuable area: light and warmth all day, and also enough space for larger plants. But the soil also dries out more quickly here. So water regularly (then tomatoes and co. also work) or use drought-loving species (e.g. Mediterranean herbs). Nutrients are the first to be consumed or displaced here, so fertilise now and then


For plants that need light, the orientation plays the biggest role here. So arm yourself with a compass, or observe the course of the sun. Rather up or down is secondary (as long as you don't plant too densely). Plant large vegetable plants such as tomatoes, fennel, cucumbers, runner beans and celery in the terraces at the outermost edge and provide them with a support or climbing aid (rod, trellis, string). But leave enough space for them to develop.


If the Spiral Planter is on a paved surface, you should plant shallow-rooted plants in the lowest shelves. This is the wettest but, depending on the orientation, also the darkest location. Try e.g. wild garlic, earth ivy
*Small tip: plant pumpkins in the second to last terrace, so the plant has enough root space and can still tend to the ground.

Planting ideas



Pineapple-cherry, aubergines, bush tomatoes, bush beans, chilli, peas, hanging strawberries, garlic, leeks, chard, carrots, peppers, radishes, radishes, salads (e.g.. deer tongue, romaine lettuce, rocket, Asian lettuce), spinach, tatsoi, courgettes, onions
Herbs: Anise, basil, betony, savory, borage, curry herb, tarragon, St. John's wort, nasturtium, lavender, marjoram, olive herb, rosemary, sage, thyme, hyssop
Flowers: Balloon flowers, mountain mint, erica, geraniums, houseleeks, hussar's buttons, cosmos, snapdragons, wall peppers, poppies, musk mallow, motherwort, carnations, petunias, marigolds, pansies, marigolds, marigolds, violets


Vegetables: Asia lettuces, cauliflower, broccoli, bush beans, peas, lamb's lettuce, kale, hedge onions, garlic, kohlrabi, pumpkin, leeks, chard, carrots, pak choi, parsnips, radishes, radish, beetroot, rocket, celery, spinach, stem mush, wild strawberry, white cabbage, savoy cabbage
Herbs: bears garlic, dill, chervil, coriander, mint, oregano, parsley, burnet, sorrel, chives
flowers: Bach carnationwort, elf mirror, tundra, lungwort, primroses, troll flowers, violets, ornamental fern, ornamental ivy

For shady locations:

Herbals:Watercress, Woodruff, Rue, Lemon Balm, Lungwort
Flowers:Tundrails, Ornamental Ferns, Ornamental Ivy

General planting tips

Tips for the assembly

The Spiral Planter should stand on a straight and firm surface - for example, on stone slabs. Soft and permanently damp ground should be avoided. The location should be chosen so that the Spiral Planter is sufficiently exposed to light from all sides.

Due to its triangular shape, the Spiral Planter can be aligned in such a way that a "one hundred percent" north side can be avoided: First assemble the Spiral Planter completely. Now look at the planter shelves. Align the Spiral Planter so that all three sides with the largest planting area face south, east and west.

It is best to fill the Spiral Planter with soil while it is being assembled. This will ensure that no cavities are missed. When doing this, leave enough space for the next plug-in connection. Always press the soil down a little to prevent it from sinking later.

We recommend normal planting or vegetable soil. For the sake of the environment, we recommend organic and peat-free. However, this has a lower water storage capacity (especially important for the upper levels of the Spiral Planter). We recommend using peat-free soil with coconut components (e.g. "coco peat"), as this increases the water storage capacity. Also, when buying peat-free soil, make sure that it contains a low proportion of wood components (e.g. wood fibre), as these decompose too quickly.

Size matters

Always keep the "full-grown" plant in mind: A plant with a lot of leaf green should be planted either on the plateau level or in the lowest terraces so that it does not take away the light from the lower plants. Larger plants should always be planted in offset (not directly on top of each other). Many vegetables are also available as low varieties: bush tomatoes, for example, produce wonderfully sweet fruit and a high yield, but do not grow taller than 40cm. 

What do I plant in the little corners?

In order to make use of the small corners, you can either sow them with flowers or herbs,
or you can also plant them, for example, with houseleeks (Sempervivum) or Sedum species

Sunny or shady?

Look out for sunny or shady areas: Lettuce, for example, needs quite a lot of light, while kohlrabi can cope with a little less.

Sowing in the Spiral Planter

Direct sowing in the Spiral Planter is possible. However, you should keep an eye on the location and orientation. Many seeds need sunny and warm conditions to germinate well. The shadier the location, the more "mature" the plant should be. That way, it too will find its way to the light.


On hot summer days, the Spiral Planter needs to be watered daily. When using a watering can, it is advisable to turn the spray head upwards so that it is easier to water the plant terraces on the sides. Alternatively, you can water automatically with a drip hose and a timer. The drip hose must be incorporated during the installation. Our tip for the summer: cover the soil with a thick layer of bark mulch - this will prevent it from drying out quickly and you won't have to water it as often.