



Calamintha nepeta ssp. nepeta

Phlomis russeliana

Sanguisorba officinalis

Calamagrostis acutiflora

Salvia nemorosa

Knautia macedonica

Persicaria amplexicaulis

Sanguisorba

Persicaria amplexicaulis

Hydrangea arborescens

Salvia nemorosa

Persicaria affinis

Achillea millefolium

Lavandula intermedia

Veronicastrum virginicum

Zinnia elegans

Limonium sinuatum

Rudbeckia fulgida

Sedum spectabile

Delphinium hybrida

Delphinium elatum

Coreopsis

Sanguisorba tenuifolia

Penstemon digitalis

Pennisetum alopecuroides

Helleborus orientalis

Helleborus orientalis

Deschampsia cespitosa

Coreopsis verticillata

Gypsophila paniculata
To successfully establish the 'JS Calor' knotweed seedling, choose a location that offers plenty of sunshine or light partial shade, but avoid scorching hot places unless you can provide regular watering. This Himalayan perennial is grateful for loamy and humous soil that can retain moisture but is not permanently waterlogged or muddy. Before planting itself, we recommend improving the soil by working in mature compost, which will support a quick start for the plant. Plant the seedlings with a spacing of 40–60 cm (approximately 3 to 5 plants per square metre) so they have enough space to form their typical, up to a metre tall and rich clumps. Water the plant thoroughly after planting and keep an eye on the moisture, especially in the first weeks before it fully takes root.
Knotweed is a plant that literally loves water, and therefore watering is the most important point of care, especially on hot summer days. If you treat the plant to enough moisture, it will reward you with lush growth and a flood of coral-red flower spikes from July to October. As for fertilizing, this perennial is not too demanding; adding a dose of organic fertilizer or compost in the spring is enough. A great advantage of the 'JS Calor' cultivar is its extraordinary resilience – it does not suffer from diseases or pests, not even slugs, which makes it an ideal choice for maintenance-free and ecological gardens, where its flowers additionally reliably attract bees and other pollinators.
Care for knotweed during the year is minimal, since it is a long-lived perennial that will last for many years in one place. With the arrival of winter, no complicated measures are necessary, because the plant is fully frost-resistant down to -28 °C (zone 5a) and overwinters in our conditions without problems without the need for covering. The above-ground part of the plant dies back and dries up with the first frosts. We recommend leaving these dry stems and leaves on the flowerbed over the winter as natural root protection and removing them with a deep cut just above the ground early in the spring (March), before new shoots begin to sprout. This will keep the plant vital and ready for the new season.
If you are considering growing knotweed in containers or window boxes, it is possible, but you must count on its greater demands for space and moisture. Given its height of 75–100 cm, choose a sufficiently large and stable pot with drainage holes. You must never let the soil in the container dry out completely, which in summer can mean even daily watering. Although knotweed stands out better in flowerbeds in the company of grasses and asters, it can serve as a solitary element on a terrace in a container, provided you ensure conditions similar to those in its natural environment – i.e., moisture and nutrients.
The information given is based on our experience, please use it as a guide only. Times may vary depending on the season, climate, location, sowing and transplanting dates and possibly also the conditions in the greenhouse/greenhouse. We always recommend testing how the plant performs in your conditions. Please do not take this as a guarantee.
See how the seedling looks over the course of a year.



Persicaria amplexicaulis

Persicaria amplexicaulis

Persicaria amplexicaulis

Persicaria affinis

Persicaria amplexicaulis

Persicaria amplexicaulis

Persicaria amplexicaulis

Persicaria amplexicaulis

Persicaria amplexicaulis

Alchemilla mollis

Achillea millefolium

Verbena bonariensis

Salvia nemorosa

Perovskia atriplicifolia

Gaura lindheimeri

Echinacea purpurea

Echinacea pallida

Eryngium planum

Echinacea purpurea

Salvia nemorosa

Calamintha nepeta

Rudbeckia fulgida

Calamintha nepeta ssp. nepeta

Salvia nemorosa

Gaura lindheimeri

Leucanthemum vulgare

Achillea millefolium

Perovskia atriplicifolia

Salvia nemorosa