There are three main ways to breed perennial grass:

1. Cutting: The small rosettes around the big rosette can be picked off in the growing season, and those with roots can be put directly into the pot, and those without roots can be dried for a few days before planting; You can also cut off the small rosette at the front end of the stem, air it for a few days, and then use sand or vermiculite for cutting. After cutting, the medium is kept slightly wet and easy to take root.

2. Leaf cutting: Although it can survive, its success rate is low and it is not suitable for Eupatorium adenophorum.

3. Seed propagation: If seeds can be collected, they can be used for propagation. When sowing in early spring is at 65438 00℃, it usually takes 2-6 weeks to germinate. When the seedlings are big enough, they are transplanted into flowerpots, but the seedlings propagated by seeds grow slowly. Many new varieties of perennial grass are also obtained by hybrid sowing.

Second, matters needing attention:

Master the principle of "no watering, no watering, no watering thoroughly" to avoid long-term accumulation of water, so as not to cause root rot, but not too dry, otherwise the plant will not die, but grow slowly or completely stagnate, and the fleshy leaves will be dull and lack vitality. Apply the decomposed dilute solution once every 20 days or so.

Low nitrogen, high phosphorus and high potassium dilute liquid fertilizer or compound fertilizer. In winter, the temperature shall not be lower than 5℃ at night and 15℃ during the day. Plants can continue to grow, and they can be watered normally and fertilized properly. If watering is controlled to make plants dormant, they can also withstand the low temperature of 0℃.

Perennial grass is not heat-tolerant. After May, with the increase of temperature, plant growth gradually stopped and entered the summer dormancy period. It can be maintained under a shade shed or other places without direct sunlight. Pay attention to good ventilation, stop fertilization, control watering, and prevent rain, especially for a long time, to avoid plant rot caused by sweltering heat, humidity and soil water accumulation.

Turn the pan every 1~2 years in spring or autumn. When turning the pot, trim the root, cut the dead root or the elder root. Pot soil should be loose and fertile, with good drainage and ventilation. You can use half humus or peat soil, coarse sand or vermiculite, and mix a small amount of calcareous materials such as bone powder. Because the soil is wet, the newly planted plants don't need to be watered too much, and they are kept in a semi-dry state, which is conducive to the recovery of the root system.

Controversy over the classification of perennial grasses;

The main classification dispute of Eupatorium adenophorum is the division between this genus and Jovibarba. The morphology of Hedyotis diffusa and Eupatorium adenophorum is very similar, but the most obvious difference is that Hedyotis diffusa has 6 petals, occasionally 7 petals, while Eupatorium adenophorum has 8~ 18 petals; The flowers of Xu Shen grass are yellow, white and bell-shaped, while those of Changxu grass are pink and star-shaped.

The difference between non-flowering plants is that long grass will grow lateral buds in the axils at the bottom of some rosettes to reproduce; The lateral buds of Hedyotis diffusa grow near the leaf center, which seems to be split from the leaf center. Even if the lateral buds of some species grow on the lower side, the lateral buds of Hedyotis diffusa are all spherical, which are smaller and more compact than the young plants of perennial grass.

In addition to the differences in appearance, some scholars who advocate the independence of Hedyotis mainly based on the chromosome number of the two.

However, even though there are some differences between Eupatorium adenophorum and Eupatorium pseudoadenophorum, the classification website of angiosperm phylogeny based on molecular research results still supports reducing Eupatorium adenophorum to a synonym of Eupatorium adenophorum, that is, it does not support separating the former from the latter.