Thermopsis

Although the two plants look very similar, Thermopsis is much hardier and more resilient. Lupines often weaken after a few years in a bed and are very susceptible to aphids and mildew. Thermopsis, on the other hand, can remain in one spot for decades without losing vigor, avoids pests, and is practically maintenance-free. It blooms exclusively in a pure yellow color.

Thermopsis (Thermopsis villosa) is a long-lived and very hardy perennial that strongly resembles the well-known lupine in appearance.

It grows to an impressive height of 120 to 140 cm and forms sturdy clumps of green leaves. During May and June, it is literally covered in vibrant, lemon-yellow blossoms. It is the ideal plant if you are looking for a low-maintenance, striking focal point for the back of a flower bed.

No, Thermopsis does not have winter interest. It is a classic herbaceous perennial that dies back. In the autumn, its above-ground parts will gradually dry out and die. During the winter, the plant rests hidden underground, and with the arrival of spring, it will sprout new, fresh green shoots again.

It is definitely not necessary. Goldenrod will surprise you with its extreme frost resistance. It falls into hardiness zone 4a, which means it will survive even the harshest winters with temperatures dropping to -34 °C without any problems and without the need for winter protection. In the spring, it will reliably sprout again from its roots.

Yes, you need to be very careful about this. Like many other legume family plants, Thermopsis is poisonous. It contains alkaloids that can cause serious health problems if ingested. If you have small children or curious pets in your garden, we recommend placing the plant where they cannot easily access it.

Definitely! Goldenrod is great for cutting. Its sturdy stems with lemon-yellow flowers last a very long time in a vase. Moreover, it is also excellent for florists and lovers of dried arrangements. For drying, you can use not only the flowers themselves and attractive leaves, but later also the maturing seed heads, which look very interesting in decorations.

Thermopsis thrives best in full sun or light partial shade. In nature, it grows in open clearings and mountain slopes, so it loves bright positions. Regarding soil, standard loamy garden soil is perfectly suitable. Thanks to its very rich and deep root system, this plant is also popularly planted on slopes, which it helps to reliably stabilize.

We do not recommend container growing. Due to its vigorous growth and very deep roots, the poppy requires a significant amount of underground space. In the confined space of even the largest pot, it would likely struggle, fail to reach its usual height, and would not bloom as prolifically as it would in the open soil of a garden bed.

This problem is most often related to root disturbance. The poppy develops a massive, deep root system and handles transplanting very poorly. You should remove the root ball from the supplied pot with maximum care and plant it directly into its permanent location. If you have already transplanted a mature plant, give it time, regular watering, and patience.

Yes, propagating older plants by division is possible, but it requires great caution and strength. Thermopsis has an extremely deep and firm root system that is difficult to dig up. The best time for potential division is early spring. In general, however, the plant does not like root disturbance and thrives best when left to grow undisturbed in one place.

We have great news! Unlike classic lupines, which are often troubled by aphids or fungal diseases (e.g., powdery mildew), Thermopsis is completely healthy and hassle-free. It does not suffer from any common diseases and pests tend to avoid it. Consequently, growing it is completely worry-free.