Leaves, fruit.
Herbalists often suggest blackberry leaf as a general herbal astringent. It is used for treating inflammation in the throat and the mouth and in the treatment of non-specific acute diarrhea. Herbal tea mixtures often contain the dried or fermented leaves of the blackberry. The astringent properties contained in the leaves of the raspberry are also recognized by herbalists and these leaves are principally used in the treatment of diarrhea or used as gargle for different kinds of mouth or throat infections. The leaves are also included as ingredients in commercial herbal tea mixtures sold in the market. The pain during labor was traditionally treated using an herbal raspberry tea. The blackberries are eaten as raw or cooked. Ripe fruits can be obtained from July through to November, and the best varieties give delicious fruits and, with a range of fruit types. Berries are also made into fruit syrups, fruit jams and as other kinds of preserves - the berries have been traditionally prepared in this way. Stomach disorders can arise in some people if they eat the fruit before it has had a chance to ripen and are still quite soft, while others do not have any problem with eating the fruit at any stage. The blackberry root is also cooked and eaten in some places. Ideally, roots for consumption should be neither too tender nor too hard; roots that need to be boiled for long periods of time must be avoided. While the tender young leaves are ideal in making a tea, the dried leaves can also be used. Herbal tea blends often include the dried leaves of the blackberry - these are sold at many herbal shops. The tender young shoots of the herb are also consumed raw in salads. These tender shoots are collected as they come up from the ground early in spring; they are peeled and then eaten raw or mixed with other vegetables in a salad.
The blackberry is cultivated mainly for its delicious berries; the shrub is a native Europe species. It has crossed the Atlantic and is now found in the north eastern and central states of the US. The shrub is a common hedgerow plant and thrives in scrubland, in thickets, and along the edges of woodland. The blackberry is also an invasive species in gardens and near human settlements. The blackberry is very easy to cultivate in well drained loamy soils and it grows well in most soils. The blackberry can grow well both in acidic and in alkaline calcareous soils as long as the soil is well drained. The shrub is tolerant of poor soils and can be considered to be a very hardy plant. Once they are established on a site, blackberry plants are very resistant to drought and low moisture conditions. Though it does yield a lot of fruits if grown in shady sites, the plant can still successfully grow on sites with good exposure to sunlight or in the semi shade. Even when blackberries are grown in sites with fairly deep shade or against a north facing wall, they still bear fruits, even if the fruits take longer to ripen. Blackberry plants are capable of enduring severe exposure to the elements. The plants are cold hardy to at least -18�C in the winter. The variety named R. fruticosus is an aggregate species or hybrid of several hundred slightly differing varieties of the blackberry. One reason for the formation of this hybrid is that most seeds are produced by a non sexual process called apomixis and therefore all seeds are genetically identical to the parent plant producing the seeds. In some cases, when seeds are produced by sexual means, the offspring will all be slightly different genetically from the parent plant and as these offspring will then usually reproduce by means of apomixis - a new species or variety of the blackberry will result. Due to the confusion of which species to apply it to, the modern treatment does not use the name R. fruticosus, the type species of the hybrid or aggregate must be properly called R. ulmifolius. Sub-species of the blackberry that contribute to the formation of this aggregate which have all been highly recommended for their yield of berries include: the R. badius species, the R. cyclophorus species, the R. gratus species, the R. nemoralis species, the R. oxyanchus species. Species which also give an equally good yield of fruits include the R. balfourianus species, the R. broensis species, the R. carpinifolius species, the R. foliosus species, the R. fuscoviridis species, the R. infestus species, the R. insericatus newbouldianus species, the R. vallisparsus species and the R. vestitus species. These shrubs can be found forming into dense thickets and such growth makes an excellent cover for birds and many bird species are attracted to such hedges. Even when they are cut or trimmed, such thickets once established can regenerate freely and rapidly. Bees and butterflies also enjoy the nectar from the flowers of this species. This aggregate species possesses biennial stems and grows a number of new stems annually from the perennial rootstock in the ground. The stems bear fruits in the second year and then die off. The honey fungus can devastate these plants and most plants in this genus are vulnerable to an attack from the fungal parasite. The blackberry seeds will requires stratification when cultivating in a controlled environment. The seeds are ideally sown in early autumn using a cold frame to get maximum germination of the seeds. A month may be needed by stored seeds to achieve proper stratification at about 3�C and such seeds are ideally sown as early as possible in the year. Once the seeds germinate and seedlings grow out, each individual seedling must be pricked out when they are large enough to handle and grown separately on a cold frame. Late in the spring of the following year, these seedlings can be planted out into the permanent positions they will occupy. In July or August, it is possible to take cuttings of half ripened wood as another method of propagating the plant. These must be tip layered in July itself. The seedlings can be planted out in the fall. The division will take place early in spring or in the period immediately before the leaves start to drop in the fall.
Blackberry leaf contains about 10% hydrolysable tannins (gallotannins, dimeric ellagitannins), and flavonoids. Gallotannins, ellagitannins and flavonoids have also been found in raspberry leaf.
The herbal tea prepared from 1.5 g of either blackberry or raspberry leaves can be taken thrice daily as a general herbal treatment.