






Moderator: AndreasR
Saartal, WHZ 7b, 245m ü. NN, toniger Lehmboden
Wo von Problemen mit invasiver L. japonica die Rede ist, geht es stets um die Art. Hinweise, dass auch Sorten invasiv & deshalb schädlich für die Natur-Flora sein könnten, habe ich bisher nirgends gefunden (und ich habe gründlich gesucht, weil ich wissen wollte, ob in meiner L. japonica 'Hall's Prolific' womöglich Öko-Tücken stecken). Insofern würde ich an deiner Stelle versuchen, Nachbars Pflanze erstmal genau zu bestimmen - wenn's kein Problem-Teil ist, kannst du ja immer noch um Stecklinge fragen...STEWARDSHIP SUMMARYLonicera japonica invades fields, forest edges and openings, disturbed woods, and floodplains, in eastern North America, where it spreads rapidly and outcompetes native vegetation by vigorous aboveand below-ground competition. Once established, the vine may literally engulf small trees and shrubs, which collapse under the weight, and few plants survive beneath the dense canopy. It has also escaped cultivation at scattered locations in California and in Hawaii where it has the potential to become a severe pest in mesic and wet forest areas.Lonicera japonica has few natural enemies in North America and is difficult to control once established. Thus, the best and most effective control method is to prevent its establishment by surveying a site for its presence regularly and immediately destroying every plant located. … IMPACTS (THREATS POSED BY THIS SPECIES)Lonicera japonica damages natural communities it invades by outcompeting native vegetation for both light (shoot competition [Thomas 1980, Bruner 1967]) and below-ground resources (root competition [Dillenburg et al. 1993a, 1993b, Whigham 1984]), and by changing forest structure (Sasek and Strain 1990, 1991). Lonicera japonica grows very rapidly, sending out numerous runners that give rise to still more runners. The vines overtop adjacent vegetation by twining about, and completely covering, small trees and shrubs. Dense Japanese honeysuckle growth can topple trees and shrubs due to its weight alone (Williams 1994, McLemore 1981). As Lonicera japonica becomes established in forest openings it forms a dense blanket that excludes most shrubs and herbs (Oosting 1956). Few tree seedlings can penetrate the mat and those that do are often quickly overgrown and bent down by the vine, and consequently die (Slezak 1976, Thomas 1980). Forests invaded by Lonicera japonica gradually lose their natural structure as canopy openings are invaded, and understory herbs shrubs and replacement trees suppressed and killed by thick mats of honeysuckle. This results in a simplified, increasingly open understory. Lonicera japonica, in turn, becomes even more vigorous with the increased light (Thomas 1980). These openings also promote further invasion by other non-native species including aggressive vines like kudzu (Pueraria lobata) and English ivy (Hedera helix) (Miller 1985; Thomas 1980). … The combined effects of above- and belowground competition can suppress growth or result in direct mortality of trees and seedlings (Whigham 1984). Bruner (1967) documented that after five years of co-occurrence, 33% of yellow-poplar seedlings were dead, 22% were overwhelmed, and 45% were heavily draped with Lonicera japonica that germinated from seed in the first year.Lonicera japonica has an additional competitive edge as it grows during part or all of the winter, when many native species are dormant (Carter and Teramura 1988a). This evergreen or semi-evergreen character allows Lonicera japonica to photosynthesize at winter temperatures and light levels. The shade it casts during early spring may inhibit ephemeral herbs that complete their life cycle in the six weeks prior to deciduous tree leaf-out. …Lonicera japonica is a severe threat in the southeastern and eastern states (Florida to Texas, north to Kansas, Missouri, central Illinois and New York), and a severe potential threat in northern states outside the current (1995) range. …GLOBAL RANGELonicera japonica is native to east Asia, including Japan and Korea (Gleason and Cronquist 1991, Lee et al. 1990). From this native range it has spread to Hong Kong (Thrower 1976), England (Clapham et al. 1962), Wales (Martin 1982), Portugal (De Baceler et al. 1987), Corsica (Jeanmonod and Burdet 1992), Hawaii (Wagner et al. 1989), Brazil, (Bove 1993), Argentina (Bonaventura et al. 1991), possibly the Ukraine (Panova 1986), and the continental United States, primarily by way of horticultural introductions. The species was introduced into the U.S. in 1806 on Long Island, NY (Leatherman 1955), and the similar but more aggressive variety halliana was introduced to the country in 1862 in Flushing, N.Y. As with many invasive species, Japanese honeysuckle initially had a very gradual rate of spread, primarily to the south and east. Lonicera japonica was not included in Chapman's Flora of the Southern States (1884; in Hardt 1986) but in 1889 Wood and Willis included the variety chinensis in their flora of the eastern United States and a decade later Britton and Brown (1898) reported that the species ranged from New York and Pennsylvania to North Carolina and West Virginia. In 1899 Lonicera japonica was described in a wildflower book as the most widely planted of the honeysuckles (Lounsbury 1899). Lonicera japonica was reported from Florida in 1903, and from Texas in 1918 (Hardt 1986). By 1912, it had "escaped from cultivation", and ranged from Connecticut to Florida (Atkinson 1912), and within a few years was identified as an invasive problem species from the Gulf of Mexico to Massachusetts, creating "a network of tangled cords that covers the ground wherever this ruthless invader gets a foot hold" (Andrews 1919). Lonicera japonica now occurs throughout the eastern half of the United States, south of a line extending from Massachusetts west to Lake Michigan, Illinois, and Missouri, and then southwest through Texas to Mexico, an area encompassing 26 states (USDA 1971, Leatherman 1955). … Lonicera japonica continues to spread northward, however, possibly due to increasing cold tolerance or warmer winters (Wagner 1986). It may spread up to 400 km north if global temperature increases 3oC (Sasek and Strain 1990). … (Quelle)
Das war der Anlass für meinen Link.Im Übrigen: Wir sollten über andere Forenmitglieder keine Scherbengerichte abhalten. Das ist hier keine Besserungsanstalt für erwachsene Gärtner. Wenn es Regelverstöße in ethischer, moralischer oder geschmacklicher Form gibt, kann man die hin und wieder schmunzelnd aufspießen. Von schweren Entgleisungen einmal abgesehen.Ich habe absolut keine Bedenken, von "über den Zaun" gewucherten, also ausgebüxten Pflanzen Ableger zu nehmen, ohne ein großes Abstimmungsprozedere einzuleiten. Meine Nachbarn werden in Kürze von dem Ausbreitungsdrang meiner japanischen Primeln profitieren. Sollte ich sie zurückverlangen?Mein beträchtlicher Pfingstrosenbestand hat seinen Ursprung in einem verwilderten und nicht mehr bearbeiteten Garten, der auf Kirchengelände stand. Der Pfarrer, den ich fragte, zuckte mit der Schulter. Das Gelände sei mal verpachtet worden, die Pächterin verstorben, die Erben kenne er nicht. Auf meine Frage, ob ich denn, sagte er mir, nun das werde in Kürze eine Viehweide, ich solle ruhig. Dazu war er rein rechtlich nicht befugt. Dennoch habe ich.Anderes Beispiel: Hier wurde unlängst die Empfehlung gegeben, in BoGa's das Personal um Sämlinge, Ableger etc. zu bitten. Dies könne durchaus erfolgreich sein. Das dürfen die gar nicht. Jeder weiß das. Im Nizza-Park, Frankfurt, samt sich so manches aus. Das wird von den Hartz-IV-Kolonnen mehr oder minder penibel ausgehackt und kommt auf den Kompost. Ich habe mir erlaubt, einige Sämlinge vor der Säuberungsaktion auszugraben. Ich hätte natürlich eine Anfrage beim Amt für Stadtbegrünung einreichen können.Wie neue Pflanzen zu uns kommen, das sei in vielen Fällen besser nicht hinterfragt. Auch die modernen Pflanzenjäger sind da gar nicht so pingelig. Aber ist das Pflänzchen erst mal durch die Hände einiger Staudengärtner gegangen und von diesen vermehrt worden, scheint ja alles in Ordnung zu sein.Dieses Thema hatten wir hier schon mehrere Male. Auch aus anderen Foren ist es sattsam bekannt.Lonicera japonica ist in wintermilden Gebieten eine echte "Problempflanze", wie sich ja auch aus dem von Fars in #1 angeführten Link entnehmen lässt.