Garden Tips

Plant and care for blue lozenge - this is how it's done

Plant and care for blue lozenge - this is how it's done

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Would you like to plant the blue rhombus in your garden? No problem, because here we explain how to do it and what you should consider when caring for it.

The blue diamond is visually similar to lavender

The robust blue diamond, which looks like lavender from a purely visual point of view, begins to develop its purple flower dress in mid-July, with the flowering phase extending into October. The reason why the blue rhombus is so extremely popular with many garden lovers.

In addition, there is an aromatic fragrance that emanates in all directions, which is why the blue lozenge, often referred to as the silver bush, can be planted excellently in fragrant gardens, but also in Mediterranean gardens or rock gardens. What you need to consider when planting and how it looks with the care of the blue rhombus, we explain here in more detail.

Site selection & planting

Blue diamonds love the sun and drought, which you must take into account when choosing a location. Ideally, you should always choose a place to the south. Then plant in the vicinity of the blue rhombus e.g. a butterfly lilac, lavender, the blue fescue (silver grass), mallow and similar shrubs or shrubs, this results in a harmonious look that is preferred by butterflies and beneficial insects.

" Tip:

The blue diamonds, which grow up to 1 meter high, are also suitable for planting pots. Water the blue lozenge in the bucket only when it is dry.

Caring for the blue lozenge properly

Rear section:

It is important that you cut back the blue lozenge, which is often referred to as Russian sage, radically year after year in early spring so that it sprouts again and unfolds its true splendor. You should also remove any shoots that have already died from the frost.


A cut should never be made in autumn, as this is the only way for the blue rhombus to protect itself against the numerous frosts in the winter months.


You can support the winter protection by heaping up the planting stick with leaves or by covering it with some twigs.

Fertilize / Casting:

Furthermore, blue lozenges should not receive fertilization, especially since they also clearly prefer nutrient-poor soils. Fertilization would adversely affect plant growth and flowering. The same applies to irrigation, since the blue lozenge can even do without water for several days.


You can easily multiply the blue rhombus by dividing it, whereby it is recommended to reposition it either in spring (after the ice saints) or immediately after flowering. (Link tip: multiply plants - 4 techniques)

Keeping the perennial in shape:

The gray-silver-colored plant perennial grows quite loosely with its violet flowers, but the individual branches are always straight up. If you want to keep the perennial more compact, you should wrap it relatively loosely with bast, so as not to restrict its natural beauty too much.

" Tip:

Individual branches of the blue rhombus are also excellently suited for the production of flower arrangements - which can then even be used to bind fragrance bouquets!