City climate suitable Archive

DocKalle Portuguese oak, Quercus faginea

Quercus faginea (Portuguese oak, Zen oak)

Quercus faginea (Portuguese oak, Zen oak) can reach growth heights of up to 20 meters and trunk diameters of up to 80 cm. The maximum age is 600 years.

Pollination of this species of oak is carried out by the wind. Quercus faginae is often found in Portugal, Spain as well as northwestern Africa. It also grows very frequently in the Balearic Islands.

The wood is often used as firewood or tree wood. The acorns are popular in the Iberian Peninsula for fattening pigs.

It is interesting that the leaves change color after the growing season, but do not fall off the tree. This happens only when the leaves sprout in the following year.

Quercus faginea likes calcareous soils. Often they grow together in communities with cork, Pyrenean and oak. It is resistant to the climatic stresses of cold, drought and thermal contrasts.

Some interesting pictures of this oak species can be found here: http://www.mittelmeerflora.de/Zweikeim/Fagaceae/querc_faginea.htm

Quercus faginea (Portuguese oak, Zen oak)

Acorns City climate suitable Climate Warming Resistant

DocKalle Pyrenean Oak, Quercus pyrenaica

Quercus pyrenaica (Pyrenean oak)

Quercus pyrenaica (Pyrenean Oak) is found especially in western southern Europe. It is common in Spain and Portugal. They can also be seen regularly in western France and Morocco.

Although it is called “Pyrenean Oak” it is rarely found in the Pyrenees.

It often grows in shrub form, but can also reach heights of up to 20 meters.

The very large leaves (up to 15 cm long and 9 cm wide) are striking. The leaves have yellow-gray felt-like hairs on both sides.

Dryness she tolerates very well. It also feels quite comfortable on acidic soils. Lime likes them very much. It also accepts sandy soils. It is resistant to frost and also tolerates road salt. Their wind resistance is also good. Since it does not tolerate paving, it is conditionally suitable as an urban tree. However, their resistance to pollutants is quite good. In Central Europe they are always found in parks or arboretums. It also tolerates wetness.

The southern European flair that it exudes is impressive. People who love vacations in Portugal or Spain, appreciate this tree very much. It likes locations flooded with light.

This very beautiful species can be purchased in acorn form here: https://quercus.guru/produkt/quercus-pyrenaica-pyrenaeen-eiche/

Acorns City climate suitable Climate Warming Resistant

DocKalle Pyrenean oak Karlsaue, Quercus x andegavensis

Quercus x andegavensis (Pyrenean Oak Karlsaue)

Quercus x andegavensis (Pyrenean Oak Karlsaue) is a cross between Quercus pyrenaica and Quercus robur. The variety “Karlsaue” comes from the Karlsaue Palace Park in Kassel.

It is considered to be moisture tolerant and (currently) suitable for urban climates. The tree can grow up to 30 meters high.

Some pictures: https://www.cardiffparks.org.uk/trees/roathpark-botanic/quercus-x-andegavensis.php

The acorns can be purchased here: https://quercus.guru/produkt/quercus-x-andegavensis/

Acorns City climate suitable Climate Warming Resistant

DocKalle Acorn case

Acorn case with special oak species

Acorn case – Rare and international oak species
The special gift for oak and tree lovers

With this acorn case you get a special (and above all rare!) Gift for tree lovers.
All acorns were collected (in different places in this world) in September and October 2023.
The acorns are currently stored in a cool, low-light place in a slightly moistened soil mixture.

In this case there are 5 acorns each from:
* Quercus acerifolia, maple-leaved oak (very rare). Home: Arkansas, USA
* Quercus petraea, sessile oak. Home: Central Europe

* Quercus saltillensis (very rare). Home country: Mexico
* Quercus illicifolia (scrub oak). Home: Northeastern USA.

* Quercus parvia (Santa Cruz Island Oak). Home: California, USA.
* Quercus heterophylla (Bartram’s oak). Home: Eastern USA

* Quercus cerris (wrench oak). Home: South of France
* Quercus depressa (Low Oak) (rare). Homeland: Mexico.

* Quercus robur (English oak). Home: Central Europe
* Quercus rubra (red oak). Home country: USA

Total quantity: 50 acorns.

Of course, the acorns are not added to the case “naked” but in small bags with a moistened earth mixture (to survive the transport well).

Attention: in order for different acorns to germinate next year, it is important to treat them appropriately.
Quercus acerifolia, Quercus illicifolia, Quercus heterophylla, Quercus cerris, Quercus robur and Quercus rubra should be stored in the refrigerator in a slightly moistened soil mixture for a few weeks, if possible (please keep checking to see if they germinate and then transplant directly).

Quercus petraea, Quercus saltillensis, Quercus parvia, Quercus depressa may start to germinate already this year (please store in soil mixture).

Please plant Quercus saltillensis, Quercus parvia and Quercus depressa protected from frost.

In the store you can buy the case with acorns.

City climate suitable Climate Warming Resistant Other trees (except oaks) Unkategorisiert

DocKalle Oriental plane, Oriental plane tree, Platanus orientalis

Platanus orientalis (Oriental plane tree, Oriental plane tree)

Platanus orientalis is found especially in southern Europe (Sicily, Greece). In general, their range is huge. It is found in the Middle East, Central Asia and even in the Himalayan region.

It reaches growth heights of up to 30 meters and is often used as a street tree. The trunk can become so extensive that in the Middle East even rooms are built into it. The crown of the tree can become very sprawling.

The flowering period is in May. Pollination occurs through the wind.

Oriental plane trees can excellently cope with heat and drought. They do not tolerate waterlogging of any kind. Platanus orientalis likes full sun and is a classic light tree. It is considered sufficiently frost-hardy and can therefore thrive in Central Europe. Genrell it is also considered a very wind-resistant tree. See also: https://de.wikipedia.org/wiki/Morgenl%C3%A4ndische_Platane.

The wood of the oriental plane tree is considered to be vulnerable outdoors and is therefore more commonly used indoors.

Meanwhile, the Ortientplatane is increasingly used in non-native forests due to its climate resistance. The flaking bark provides shelter for many insects. It also protects other trees with its storm resistance. Due to its spreading branches, it provides shade for soils and prevents them from drying out.

It copes with almost all soils.

Probably the most famous Oriental plane tree is the “plane tree of Hippocrates” on the Greek island of Kos. According to legend, it was planted by Hippocrates himself. Later he taught his students under the tree. However, the plane tree should be “only” about 500 years old. It has been a natural monument since 1985.

For germination of seeds is recommended to first put them in a water bath for 24 hours. Then they go into a damp (not wet, not dripping) mixture of earth and sand. Optimal is to cool this 90 (!!) days, if necessary, they can be placed outside for a few nights (in frost). It is recommended to always check if they germinate. After the procedure: In the spring, put in plant pots and grow in a sunny place. However, be careful: young seedlings need slightly shady places in midsummer.

The seeds of the oriental plane tree can be bought here.

Acorns City climate suitable Climate Warming Resistant Unkategorisiert

DocKalle Dismantle, Quercus cerris, Swiss oak

Quercus cerris (Turkey oak)

Quercus cerris grows up to 200 years old and reaches heights of up to 35 meters. The trunk grows up to 2 meters thick.

The acorns ripen relatively early (September to October) and grow up to 3 cm long. They usually sit in a spiny cupule. Originally they are found in southern France, southeastern Europe (e.g. Albania, Bulgaria) and Italy. Through artificial plantings also exist many specimens in England, New Zealand and Argentina. In Central Europe, this tree species is a common park tree. In southern Europe it is one of the most common forest trees.

The leaves are dark green in summer and turn yellowish or reddish in autumn. It is considered to be resistant to urban climates. The flowers of the cercia are green-red. The flowering period is from April to May. As a deciduous tree, it loses its leaves in winter.

As a site, this oak species prefers warm and nutrient-rich soils. It grows on both calcareous and acidic silicate rock. Nevertheless, the distorting oak likes it best alkaline. The more calcareous the soil substrate, the better it tolerates drought. However, dry sandy soils are an exclusion criterion. The wood is very suitable for building (e.g. for railroad sleepers) or also as firewood. The acorns are often used as pig feed. The juice that comes out after bark injury can be made into syrup and used as a sugar substitute. Quercus cerris is very robust against wind and heat. Even air pollution and road salt do not seem to bother her. It is also quite resistant to pests. Oak processionary moth or oak splitting beetle have it with this plant heavy.

When young, Quercus cerris grows up to 30 cm per year.

In the current “temperate” zones, the cedar is considered the tree of the future against global warming. It tolerates two to three months of summer drought. Very well it can be grown as a pot plant (in very deep pots), moreover, it is very frost hardy. It tolerates temperatures down to – 20 degrees.

For sale are the acorns here in the store

Acorns City climate suitable Unkategorisiert

DocKalle Quercus heterophylla

Quercus heterophylla (Variegated Oak, Bartram’s Oak)

Quercus heterophylla (Variegated Oak, Bartram’s Oak) is originally from the USA (eastern range). It is a hybrid of Quercus robur and Quercus phellos. In the Netherlands, one tree of this species is known, which has a trunk circumference of 4 meters. Maximum heights of this tree are 26 meters.

See: https://www.monumentaltrees.com/de/baeume/quercusxheterophylla/rekorde/.

Leaves are oval, elliptic, oblong to lanceolate, smooth-edged to coarsely toothed, glossy green, 8-18 cm long. In autumn, these turn red. The upper side is shiny green and bare. The underside is lighter and hairy only in the vein axils. Quercus heterophylla is very frost hardy (to -23 degrees) and tolerates road salt. That is why this tree is found sporadically in Europe as an avenue tree. This species also tolerates wet and poor soils, provided that they are not too calcareous. Tend to the soil should be rich in nutrients and slightly acidic. Overall, this tree species is tolerant of different soil types: Loess, clay, peaty soil, light clover soil, sandy soil, loamy
Soil.

The tree sheds only a few acorns, these have a similar appearance to Quercus rubra.

You can buy the acorns here.

Acorns City climate suitable Climate Warming Resistant Unkategorisiert

DocKalle Bur oak, Quercus Macrocarpa

Quercus macrocarpa (Bur oak)

Bur oak (Quercus macrocarpa ) is originally from northeastern America and is considered to be a “settler”. It now grows in Alaska and Canada as well as in the southern United States.

It was first mentioned botanically in 1811.

It is very heat and drought resistant and as a candidate tree against the consequences of global warming in urban areas of Europe (occurs there so far still very rarely).

The burr oak grows up to 50 meters high and reaches trunk girths of up to 3.5 meters. Their growth is relatively slow (30 cm). It is interesting to note that the more northerly the acorns occur, the smaller they become. If they reach diameters of up to 6 cm in southern climes, they are often conspicuously small in the north. The name “Macrocarpa” (= large fruit) refers to the sometimes huge acorns.

The tannic acid content of acorns is relatively low. The smaller the acorns, the sweeter they taste. Thus, the burr oak is one of the few acorns that are edible. They can be easily fried and eaten and are considered a delicacy in some areas of the United States.

The taproot of the Bur oak is considered fast growing and reaches depths of up to 1.5 meters after only two years. The oak species lives up to 400 years. The leaves can grow very large (15 cm long and 5 cm wide) and have a leathery appearance. Due to its very thick bark, this oak species is even (somewhat) resistant to forest fire.

Optimal for the Bur oak are weakly acidic soils. The tree is also considered suitable for urban climates, but grows very sprawling in width. Sunny sites this tree, like most oak species, likes very much, shade sites are not suitable. The tree is sometimes even described as very resistant to the effects of road salt, see e.g. https://www.angelbachtal.de/dr/bur-eiche-grossfruchtigeeiche.

The wood is thick, tough, heavy and durable. It is one of the most valuable barrel and furniture woods. In addition, it is also used in construction for flooring and the like.

You can buy the acorns in our store.

Quercus Macrocarpa Source: https://en.wikipedia.org/wiki/Quercus_macrocarpa#/media/File:Big_Tree_with_spring_picnic.jpg

Acorns City climate suitable Unkategorisiert

DocKalle Quercus petraea

Quercus petraea (Sessile Oak, Winter Oak)

Quercus petraea (the Sessile Oak, also known as the Winter Oak) reaches growth heights of up to 40 meters and trunk girths of up to 2 meters. It can live up to 1000 years.

Acorns ripen from September to October and grow up to 2.5 cm long. They grow in a kind of “cluster” (hence the name sessile oak). The bark of this oak species is smooth when young. A thick, deeply longitudinally fissured, gray-brown bark develops with age.

This species of oak is often found in slightly mountainous areas, it seems to especially like sunny slopes. It is found in many European countries (from Italy to Scandinavia). It is found especially on stony and clay soils; likewise on nutrient-poor soils. However, it does not like waterlogging and too much moisture. It is considered storm-resistant and can penetrate soil layers that are poor in oxygen. In sub-Mediterranean climates, it forms mixed forests with downy oak and Turkey oak. Evidence shows that it has been present in Europe for about 10 million years.

Quercus petraea is relatively drought resistant and is more likely to survive climate warming than the English oak. It is considered to be very heat-loving. It is also considered (in Europe) to be tolerant of heat, drought, emissions and salt. For these reasons, it is also often planted in urban areas. Sessile oaks sprout very early in the year and their leaves can still be found late in the season.

The acorns have a high starch content (almost 40%) but are very bitter without specific water treatment (flushing). However, in principle, they are suitable for an acorn coffee.

Originally, they were used especially for fattening pigs (even before the use of wood). The wood is readily used for construction activities or even wine barrels. In Central Europe, the sessile oak provides a home for up to 500 insect species.

In medicine, the sessile oak is widely used because it is very rich in tannins. Pieces of bark used to be placed on wounds and injuries because they prevent inflammation and stop bleeding. Oak tea of this type is also used against liver disorders and diarrhea.

About the sessile oak see also this link

You can buy acorns of sessile oak in our store.

Acorns City climate suitable Climate Warming Resistant Unkategorisiert

DocKalle Quercus rubra, Red oak

Red oak (Quercus rubra)

The red oak (Quercus rubra) is native to the USA, where it is the state tree of the state of New Jersey.

The red oak can grow up to 35 meters.
Untypically for oaks, the bark is initially smooth when the tree is young and only becomes rough and “barky” with age.
The leaves turn to a rich red (reddish brown) in the fall. For the latter reason, the red oak is also often found in parks.
It begins to fructify (form acorns) at about age 25.
The acorns have a two-year development period. This feature is beneficial against pest infestation, as pests are not adapted to the two-year development period of acorns.
The fruits remain very small in the first year and ripen only in the second year. An acorn is about 2×2 centimeters, egg-shaped and only partially surrounded by a fruit cup.

Originally it comes from the eastern part of the USA, but has been used in Europe since the 17th century.
It is considered to be assertive and relatively climate robust. It is considered relatively drought tolerant and storm resistant due to its taproot system.

Their alien origin is neglected in trade-offs against the benefits of increased timber harvest.
“Other than general conservation discomfort with guest tree species, red oak is seen as unproblematic in most cases. Undesirable spread in mature coppice and border sites, especially in rocky areas where native rocky flora may be displaced. Because it is less accepted than native oaks by specialized and phytophagous insects, it establishes species-poor biocenoses (Source:
https://www.lw-heute.de/je-waermer-desto-regen-braucht-roteiche).

In Germany, a study exists comparing species diversity on red oak (Quercus Rubra) and English oak (Gossner 2004):

* Compared to the English oak, the red oak crown monocultures are poor in individuals and species.
* The differences are more pronounced in the pure stock.
* Red oak has significantly lower numbers of individuals and species of endangered insect species. Nevertheless, the red oak is not an “ecological desert”.
(cf. also https://www.lwf.bayern.de/biodiversitaet/biologische-vielfalt/230750/index.php).

You can buy acorns of red oak in our store.

Category Archives: City climate suitable