Saturday, February 27, 2016

Hemerocallis fulva

Hemerocallis fulva, the orange day-lily,tawny daylily, tiger daylily, fulvous daylily or ditch lily (also railroad daylily, roadside daylily, outhouse lily, tiger lily, and wash-house lily), is a species of daylily native to Asia. It is very widely grown as an ornamental plant in temperate climates for its showy flowers and ease of cultivation. It is not related to true lilies, but gets its name from the similarity of the flowers and from the fact that each flower lasts only one day.



Orange daylily is native to Asia from the Caucasus east through the Himalaya to China, Japan, and Korea. Orange daylily persists where planted, making them a very good garden plant.


Hemerocallis fulva var. fulva has escaped from cultivation across much of the United States and parts of Canada and has become a weedy or invasive species. It persists also where dumped and spreads more or less rapidly by vegetative increase into woods and fields and along roadsides and ditches, hence the common name ditch lily. It forms dense stands that exclude native vegetation, and is often so common that it is mistaken for a native species.

Daylilies established in natural areas pose a threat to native plants in field, meadows, floodplains, moist woods and forest edges. Once established, daylily multiplies and spreads to form dense patches that displace native plants. The thick tubers make it a challenge to control.

Corn Cockle (Agrostemma githago)

Corn cockle has grown as a weed among grain crops for millennia. It grew around Europe’s first Stone Age inhabited areas, and signs of it have been found in Pompei, which was covered in volcanic ash in ancient times. Corn cockle used to be a very familiar weed in rye fields in the south-western archipelago, and elsewhere in Finland it has sometimes appeared as an abundant alien, especially in fields that have been sown with Russian oats. Corn cockle also became more common in the years following crop failures, because seed then had to be imported.

The whole plant, especially the seeds, contains poisonous compounds, and they can spoil flour if they are not removed: the food tastes bad, and a larger amount can cause nausea and worse – it has been claimed that even five seeds is enough to cause death by paralyzing the respiratory system. Like many annuals corn cockle produces a lot of seed, up to 2,500 from a single plant. 

It likes cultivated soil, and it has overwintered at least partly mixed in with crop seed in grain silos. Over the last century it has been hit hard by changes in farming methods, especially the development of more efficient seed-cleaning, and it almost died out in Finland in the 1960s.
Nowadays corn cockle grows as a casual alien everywhere in Finland except northern Lapland along railways, in harbours, and on dry banks and waste ground. Finding it requires a slice of good luck however, and many eager botanists have never set eyes on it in the wild.

It grows with a stem to 100 cm long with lanceolate leaves. The flowers are up to 5 cm in diameter, usually single at the ends of the stem. The sepals have 5 narrow teeth much longer than the petals. It has 10 stamens. It has slender pink flowers. It is a stiffly erect plant up to 1 metre (3 ft 3 in) tall and covered with fine hairs. Its few branches are each tipped with a single deep pink to purple flower. The flowers are scentless, are 25–50 millimetres (1–2 in) across and are produced in the summer months – May to September in the northern hemisphere, November to March in the southern hemisphere.


Each petal bears two or three discontinuous black lines. The five narrow pointed sepals exceed the petals and are joined at the base to form a rigid tube with 10 ribs. Leaves are pale green, opposite, narrowly lanceolate, held nearly erect against stem and are 45–145 mm (1.8–5.7 in) long. Seeds are produced in a many-seeded capsule. It can be found in fields, roadsides, railway lines, waste places, and other disturbed areas.

Friday, February 19, 2016

Tussilago farfara

Tussilago farfara, commonly known as coltsfoot, is a plant in the groundsel tribe in the daisy family Asteraceae, native to Europe and parts of western and central Asia. It has had uses in traditional medicine. The name "tussilago" is derived from the Latin tussis, meaning cough, and ago, meaning to cast or to act on. 

Coltsfoot is a perennial herbaceous plant that spreads by seeds and rhizomes. Tussilago is often found in colonies of dozens of plants. The flowers, which superficially resemble dandelions, appear in early spring before dandelions appear. The leaves, which resemble a colt's foot in cross section, do not appear usually until after the seeds are set. Thus, the flowers appear on stems with no apparent leaves, and the later appearing leaves then wither and die during the season without seeming to set flowers. The plant is typically 10–30 cm in height. The leaves have angular teeth on their margins.

Tussilago farfara contains tumorigenic pyrrolizidine alkaloids. Senecionine and senkirkine, present in coltsfoot, have the highest mutagenetic activity of any pyrrolozidine alkaloid, tested using Drosophila melanogaster to produce a comparative genotoxicity test. 

There are documented cases of coltsfoot tea causing severe liver problems in an infant, and in another case, an infant developed liver disease and died because the mother drank tea containing coltsfoot during her pregnancy. In response the German government banned the sale of coltsfoot. Clonal plants of colstfoot free of pyrrolizidine alkaloids were then developed in Austria and Germany. This has resulted in the development of the registered variety Tussilago farfara 'Wien' which has no detectable levels of these alkaloids.


Coltsfoot has been used in herbal medicine and has been consumed as a food product with some confectionery products, such as Coltsfoot Rock. Tussilago farfara leaves have been used in the traditional Austrian medicine internally (as tea or syrup) or externally (directly applied) for treatment of disorders of the respiratory tract, skin, locomotor system, viral infections, flu, colds, fever, rheumatism and gout.

Thursday, February 18, 2016

Rosa acicularis

Rosa acicularis is a deciduous shrub growing 1–3 m tall. The leaves are pinnate, 7–14 cm long, with three to seven leaflets. The leaflets are ovate, with serrate (toothed) margins. The flowers are pink (rarely white), 3.5–5 cm diameter; the hips are red, pear-shaped to ovoid, 10–15 mm diameter.

The ploidy of this rose species is variable. Botanical authorities have listed it as tetraploid and hexaploid in North America (subsp. sayi), and octoploid in Eurasia (subsp. acicularis). On the northern Great Plains and in northwest Canada, extending to Whitehorse, Yukon its populations are generally tetraploid.


Propagation                                        

Seed. Rose seed often takes two years to germinate. This is because it may need a warm spell of weather after a cold spell in order to mature the embryo and reduce the seedcoat. One possible way to reduce this time is to scarify the seed and then place it for 2 - 3 weeks in damp peat at a temperature of 27 - 32°c (by which time the seed should have imbibed). It is then kept at 3°c for the next 4 months by which time it should be starting to germinate. Alternatively, it is possible that seed harvested 'green' (when it is fully developed but before it has dried on the plant) and sown immediately will germinate in the late winter. This method has not as yet(1988) been fully tested. Seed sown as soon as it is ripe in a cold frame sometimes germinates in spring though it may take 18 months. Stored seed can be sown as early in the year as possible and stratified for 6 weeks at 5°c. 

It may take 2 years to germinate. Prick out the seedlings into individual pots when they are large enough to handle. Plant out in the summer if the plants are more than 25cm tall, otherwise grow on in a cold frame for the winter and plant out in late spring. Cuttings of half-ripe wood with a heel, July in a shaded frame. Overwinter the plants in the frame and plant out in late spring. High percentage. Cuttings of mature wood of the current seasons growth. Select pencil thick shoots in early autumn that are about 20 - 25cm long and plant them in a sheltered position outdoors or in a cold frame. The cuttings can take 12 months to establish but a high percentage of them normally succeed. Division of suckers in the dormant season. Plant them out direct into their permanent positions.

Cultivation details
Succeeds in most soils, preferring a circumneutral soil and a sunny position. Prefers a slightly acid soil. Grows well in heavy clay soils. Dislikes water-logged soils. Grows well with alliums, parsley, mignonette and lupins. Garlic planted nearby can help protect the plant from disease and insect predation. Grows badly with boxwood. Hybridizes freely with other members of this genus. Produces its fruit abundantly in Britain. This plant is the floral emblem of Alberta. Plants in this genus are notably susceptible to honey fungus.

Wednesday, February 10, 2016

Thlaspi caerulescens

Thlaspi caerulescens, Alpine Penny-cress and also known as alpine pennygrass, is a flowering plant in the family Brassicaceae. It is found in Scandinavia and Europe.


Thlaspi caerulescens is a low biennial or perennial plant that has small basal rosettes of stalked elliptic–lanceolate leaves with entire margins. The one or more flowering stems have small stalkless, alternate leaves clasping the stem. The inflorescence is a dense raceme which continues to lengthen after flowering. The individual flowers are regular, with white or pinkish petals and are about 5 mm (0.2 in) wide. Each has four sepals, four petals, six stamens (four long and two short) with violet anthers, and a single carpel. The fruit is many-seeded and narrowly spatulate and has a notched tip. This plant flowers in late spring.

In Europe it is found in Finland and Sweden, in all but the most northerly regions. It is also found in the Alps, the Massif Central, the Pyrenees, eastern Norway, southern Germany, and northern England. It is a plant of dry hillside meadows, forest margins, banks, gardens, lawns, pastures, field margins, yards and bare places.

The young leaves and flowers are a good substitute for cress. They are edible raw or cooked and are often mixed with other greens as a flavoring.

Tuesday, February 9, 2016

Eruca vesicaria

Eruca vesicaria (syn. Brassica vesicaria L.) is a species of Eruca native to the western Mediterranean region, in Morocco, Algeria, Spain and Portugal. It is closely related to Eruca sativa; that species is included in E. vesicaria by some botanists either as a subspecies E. vesicaria subsp. sativa or not distinguished at all; E. vesicaria can be distinguished from E. sativa by its persistent sepals.

It is an annual plant growing to 20–100 cm tall. The leaves are deeply pinnately lobed with four to ten small lateral lobes and a large terminal lobe. The flowers are 2–4 cm diameter, arranged in a corymb, with the typical Brassicaceae flower structure; the petals are creamy white with purple veins, and the stamens yellow; the sepals are persistent after the flower opens. The fruit is a siliqua (pod) 12–25 mm long with an apical beak, and containing several seeds.

Young leaves - raw or cooked. A distinct strongly spicy flavour, the taste is best from fast, well-grown plants. A few leaves added to a salad are acceptable though the flavour is too strong for many tastes. Some people really like these leaves though most are not very keen. 

Older leaves that have become too hot to eat on their own can be pureed and added to soups etc. In the milder areas of Britain it is possible to produce edible leaves all year round from successional sowings, especially if the winter crop is given some protection. Flowers - raw. A similar taste to the leaves, they make a nice garnish on the salad bowl. The seed yields a semi-drying oil which is edible if stored 6 months and is a substitute for rapeseed oil. It contains 32% fat, 27% protein. It is known as 'jamba oil'. A mustard is obtained from the seed, the strong flavour comes from an essential oil that is contained within the oil of the seed. 

The pungency of mustard develops when cold water is added to the ground-up seed - an enzyme (myrosin) acts on a glycoside (sinigrin) to produce a sulphur compound. The reaction takes 10 - 15 minutes. Mixing with hot water or vinegar, or adding salt, inhibits the enzyme and produces a mild bitter mustard.

Hesperis matronalis

Hesperis matronalis is a herbaceous plant species in the mustard family, Brassicaceae. It has numerous common names, including dame's rocket, damask violet, dame's-violet, dames-wort, dame's gilliflower, night-scented gilliflower, queen's gilliflower, rogue's gilliflower, summer lilac, sweet rocket, mother-of-the-evening and winter gilliflower. 

Plants are biennials or short-lived perennials, native to Eurasia and cultivated in many other areas of the world for their attractive, spring-blooming flowers. In some of those areas, it has escaped cultivation and become a weed species. The genus name Hesperis is Greek for evening, and the name was probably given because the scent of the flowers becomes more conspicuous towards evening.

This plant is often mistaken for Phlox. Phlox has five petals, Dame's Rocket has just four. The flowers, which resemble phlox, are deep lavender, and sometimes pink to white. The plant is part of the mustard family, which also  includes radishes, broccoli, cabbage, cauliflower, and, mustard. 

The plant and flowers are edible, but fairly bitter. The flowers are attractive added to green salads. The young leaves can also be added to your salad greens (for culinary purposes, the leaves should be picked before the plant flowers). The seed can also be sprouted and added to salads. NOTE: It is not the same variety as the herb commonly called Rocket, which is used as a green in salads.

Description
Hesperis matronalis grows 100 cm or taller, with multiple upright, hairy stems. Typically, the first year of growth produces a mound of foliage, and flowering occurs the second year; the plants are normally biennials, but a number of races can be short-lived perennials. The plants have showy blooms in early to mid spring. 

The leaves are alternately arranged on upright stems and lanceolate-shaped; they typically have very short or lack petioles and have toothed margins, but sometimes are entire and are widest at the base. The foliage has short hairs on the top and bottom surfaces that give the leaves a somewhat rough feel. The larger leaves are around 12 cm long and over 4 cm wide. In early spring, a thick mound of low-growing foliage is produced; during flowering the lower parts of the stems are generally unbranched and denuded of foliage and the top of the blooming plant might have a few branches that end in inflorescences.

The plentiful, fragrant flowers are produced in large, showy, terminal racemes that can be 30+ cm tall and elongate as the flowers of the inflorescence bloom. When stems have both flowers and fruits, the weight sometimes causes the stems to bend. Each flower is large (2 cm across), with four petals. Flower coloration varies, with different shades of lavender and purple most common, but white, pink, and even some flowers with mixed colors exist in cultivated forms. 
A few different double-flowered varieties also exist. The four petals are clawed and hairless. The flowers have six stamens in two groups, the four closest to the ovary are longer than the two oppositely positioned. Stigmas are two-lobed. The four sepals are erect and form a mock tube around the claws of the petals and are also colored similarly to the petals.

Some plants may bloom until August, but warm weather greatly shortens the duration on each flower's blooming. Seeds are produced in thin fruits 5–14 cm long pods, containing two rows of seeds separated by a dimple. The fruit are terete and open by way of glabrous valves, constricted between the seeds like a pea pod. Seeds are oblong, 3–4 mm long and 1–1.5 mm wide. 


In North America, Hesperis matronalis is often confused with native Phlox species that also have similar large, showy flower clusters. They can be distinguished from each other by foliage and flower differences: dame's rocket has alternately arranged leaves and four petals per flower, while phloxes have opposite leaves and five petals.

(Streptocarpus) Cape primrose

Streptocarpus are easy to cultivate in a well-lit spot in the house.

Common name:  Cape primrose
Botanical name:  Streptocarpus
Group:  Houseplant
Flowering time:  Spring to autumn
Planting time:  Any season
Height and spread:  30cm (1ft) by 45cm (18in)
Aspect: Bright filtered or indirect light 
Hardiness:  Frost tender

Difficulty Easy: to moderate
Streptocarpus stomandrus

Spring/Summer
Keep in good light but do not expose to hot sun; an east or west facing windowsill is ideal
Plants in the greenhouse or conservatory will need some shade and good ventilation
Water regularly from March onwards. Plants can be watered from above or below, but don’t allow the pot to sit in water
Feed at two weekly intervals. Use a high potash plant feed at half strength from March to September or a specialist streptocarpus food
Remove dead flower stalks at their base

Autmn/Winter

  • Move to a south facing windowsill for maximum light, but move further away from the window at night if it gets very cold next to the window
  • Keep at normal room temperatures with a minimum of 7-10°C (45-50°F)
  • Plants in the glasshouse should be kept at a minimum of 5°C (40°F)
  • Stop feeding and only water when the compost is dry, plants may rot if the compost is too wet
  • Some leaves may naturally die back and can be removed
  • Crystal series plants may continue flowering so keep them in a very well-lit spot and continue feeding with quarter strength plant food
  • Potting-on

Streptocarpus 'Dale's Scarlet Macaw'

Plants can be potted-on if necessary in spring, using a specialist houseplant or multi-purpose compost
When re-potting choose a pot only slightly bigger than the current one, about a thumb's width wider in diameter, or one 'pot size' larger if using old-fashioned clay pots. A wide shallow pot or half-pot is more suitable than a deep pot.
After potting-on only resume feeding when the roots have filled the pot (i.e. appear at the base of the pot) 
In dry heated rooms that lack humidity, stand pots on a saucer of grit or expanded clay granules which is kept moist to increase humidity
Streptocarpus propagation 

Propagation

  • Leaf cuttings
  • Leaf cuttings are taken in spring or early summer choose healthy younger leaves from the centre of the plant
  • Cut across the leaf at 2in (5cm) intervals to give several sections; leaves can also be cut in half along the mid-rib
  • Fill a seed tray with a mix of equal parts peat free compost and perlite
  • Place the basal end in the compost about 1in (2.5cm) deep
  • Water well
  • Place in good light in a propagator, ideally heated, or cover with a plastic bag
  • New plantlets should develop in four to six weeks along the cut edges of the leaf segment
  • Once they are well rooted pot on to individual 3.5in (10cm) pots
  • Seed
  • Sow seed on the surface of a seed tray or pot of fine-textured seed compost
  • Do not cover, although to retain moisture cling film maybe used over the pot 
  • Keep between 21-24°C (70-75°F) in a greenhouse or on a windowsill, ideally in a heated propagator. Germination can take 10-14 days
  • Growth may be very slow at first 
  • When seedlings are established and have a true leaf, pot into individual pots
  • Feed with a balanced general-purpose liquid feed
  • From a late spring sowing plants may flower in 16-20 weeks
  • Division
  • Clumps of older plants can be pulled apart and divided when they are re-potted in the spring.