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Jeremy Bartlett's LET IT GROW blog

The wonder of plants and fungi.

Jeremy Bartlett's Let It Grow Blog
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"People from a planet without flowers would think we must be mad with joy the whole time to have such things about us." - Iris Murdoch

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Medlar, Mespilus germanica

Jeremy Bartlett's LET IT GROW blog Posted on 20 November, 2012 by Jeremy Bartlett1 November, 2018

It’s that time of year… Summer’s fruit and vegetables are just a memory and even the display of autumn leaves is coming to an end. But there’s one seasonal treat that makes November worth waiting for: the Medlar, Mespilus germanica.

Until a couple of years ago I hadn’t tried Medlars but now I have done I look forward to eating them every year.

Medlars

Medlars still on the tree, mid November

Medlars are members of the family Rosaceae and are relatives of the apple. They don’t ripen properly in this country so you have to wait for them to soften and turn brown, a process known as “bletting”, from the French word blettir, meaning to make soft. This will happen indoors if you pick the fruit in early November and store it, or outdoors after hard frosts. The first Medlars I ate were lying underneath a tree in the snow, and they were delicious.

The texture of Medlars is mushy and the colour is an unappealing brown, so it’s unlikely supermarkets will ever bother to stock this fruit. Furthermore, Medlars look like small russet apples but with an open calyx that gives rise to the fruit’s more vulgar names: “open arse” and “dog’s arse” ( “cul-de-chien” in French). The scientific name is more polite: Mespilus is derived from the Greek Mesos meaning “half” and Pilos meaning “ball”’ in reference to the shape of the fruit.

Don’t be put off by appearances. The taste of Medlars is lovely, a unique combination of cooked apple, date and apricot. The fruit is lovely raw – just scoop out the flesh, avoiding the large seeds (usually four per fruit). It is better baked in a moderate oven (gas mark 4) for 15 minutes and served with honey and cream or creme fraiche.

If you have access to enough fruit (1 kilogramme or more), medlar jelly is a lovely accompaniment to game or cold meats. The secret is to use a mixture of bletted and unbletted fruit – the former for flavour and the latter for its greater pectin content. Last year I had a problem setting my medlar jelly because I was using mostly bletted fruit. This year I had a better mixture of fruit and I also added some thick slices of lemon skin with pith and my jelly set very quickly. The recipe I use is:

Making Medlar Jelly

Making Medlar Jelly

Medlar Jelly

Day 1: Take 1kg of bletted and unbletted Medlars (ideally half and half) and cut them in half and boil them for an hour in a preserving pan, with the juice of half a lemon and just enough water to cover the fruit. Keep stirring to a minimum, to stop the jelly from going cloudy. Set up a jelly bag on a frame (I use a kitchen stool) and let the cooked fruit drip through the jelly bag into a bowl.

Day 2: Measure the juice into a preserving pan and add 375g sugar to each 500ml of Medlar juice, a vanilla pod and a muslin bag containing some thick slices of lemon with pith (to add extra pectin). Boil for five to ten minutes. (If you have a jam thermometer, boil until the mixture reaches just below jam temperature.) Pour into sterilised jars. Repeat if the mixture hasn’t set.

The above recipe is adapted from one in Mark Diacono’s excellent book “A Taste Of The Unexpected” (Quadrille Publishing, 2010). Another recipe, which I haven’t tried yet, is Medlar Cheese, which sounds delicious.

Don’t eat the seeds. The Plants For A Future website warns that Medlar seeds contain hydrocyanic acid but they are rather large and solid so will probably break your teeth or choke you before you die of cyanide poisoning.

The Medlar is a native of south-east Europe but sometimes occurs in the wild in Britain, often as a relic of cultivation (see distribution map).The Romans are thought to have introduced Medlars to central Europe and recently Medlar seeds have been found in Switzerland in deposits from the Second Century AD (reference – PDF file)*.

The Medlar is a lovely tree to grow in your garden too. Its leaves are dark green, large and leathery and it bears large white, star shaped flowers in the late spring and golden yellow-brown leaves in autumn. It grows up to 3 – 5 metres tall. Medlars often have a lovely, twisted and drooping shape and don’t require much pruning. They are self-fertile, so you only need one in your garden to produce fruit.

*For an overview of the Medlar’s origin and history, see “The Medlar (Mespilus germanica, Rosaceae) from Antiquity to Obscurity” by John R. Baird and John W. Thieret in Economic Botany Vol. 43, No. 3 (Jul. – Sep., 1989), pp. 328-372.

Posted in Edible, Ornamental | Tagged Medlar, medlar jelly, Mespilus germanica

Pear Rust, Gymnosporangium sabinae (aka Pear Juniper Rust or Pear Leaf Gall)

Jeremy Bartlett's LET IT GROW blog Posted on 4 November, 2012 by Jeremy Bartlett27 April, 2017

We have had a dwarf patio Pear Tree (Pyrus communis) in our garden for several years. It is not a great cropper, with only a couple of fruit each year, though it is very beautiful in spring, when it is covered with a mass of flowers (see photograph below).

This year it has provided some extra interest, with bright orange patches on the uppersides of several of the leaves, suggesting some kind of rust fungus. However, the disease wasn’t listed in my guide to plant pests and diseases (“Pests, Diseases and Disorders Of Garden Plants” by Stefan Buczacki and Keith Harris, Harper Collins 2000).

As summer continued, brown, gall-like outgrowths developed on the lower leaf surfaces below the orange patches. I was now less sure that I’d found a fungus. I took some photographs:

Pear Rust, early October (leaf upperside)

Pear Rust, early October (leaf upperside)

Pear Rust, early October (leaf lowerside)

Pear Rust, early October (leaf lowerside)

When I took a look on the internet and searched for “pear leaf gall” I found a piece by Harry Green on the Worcestershire Biological Records Centre website, describing a gall on Pear tree leaves (Worcestershire Record No. 21 April 2007 p. 49). The article was very helpful and included photographs of the gall on Pear, caused by the fungus Gymnosporangium sabinae.

Searching for Gymnosporangium sabinae has yielded more information on the RHS website. G. sabinae is also known as the Pear Juniper Rust because its other host is Juniper. The fungus overwinters on Juniper, where it forms a perennial infection on the stem. In spring these produce orange, horn-like outgrowths, which produce wind-blown spores. The spores then reinfect Pear trees.

The Worcestershire Record article includes a photograph of the fungus on Juniperus sabina. Wikipedia also has some good pictures on both hosts. (I have since found that my plant pests and diseases book has an entry for the related Hawthorn Rust, G. clavariiforme.)

The iSpot website also has some good photographs of the fungus. iSpot is provided by The Open University as part of the OPAL project and is an excellent way of sharing and identifying natural history observations.

Gymnosporangium sabinae is on the increase in Britain. I visited Holkham Walled Garden at the end of September and found that most of the Pear trees had the galls on their leaves. As for my Pear tree, I removed and destroyed the infected leaves to contain the infection, though I’m sure it’ll be back if there are Juniper bushes in the neighbourhood.

Pear blossom

Pear blossom

Update April 2017: Since we moved house, our patio Pear tree has been in a much sunnier spot and now yields around fifty fruit in most years. The rust reappears every year, but we remove infected leaves as soon as we find them and the tree remains in good health.

Posted in Fungi | Tagged Gymnosporangium sabinae, Holkham Walled Garden, iSpot, Juniperus sabina, Pear Juniper Rust, Pear Leaf Gall, Pear Rust, Pyrus communis

In Praise Of Persicaria

Jeremy Bartlett's LET IT GROW blog Posted on 17 October, 2012 by Jeremy Bartlett1 November, 2018
Polygonum affine in autumn colours.

Persicaria affinis in autumn colours.

Two of my favourite herbaceous plants of late summer and early autumn are both in the genus Persicaria: Persicaria affinis and Persicaria amplexicaule. In English these plants are bistorts or knotgrasses, members of the Dock Family, Polygonaceae.

Persicaria affinis is a semi-evergreen perennial that spreads to form a wide mat. The leaves are dark green and elliptical and erect spikes of small white, pink or red flowers are borne above these from July to October, reaching between 20 and 30 cm high. In autumn the leaves turn red or pink. Provided the soil isn’t too dry Persicaria affinis can be grown on a sunny bank and will trail over the edge.

Good varieties of Persicaria affinis include ‘Superba’ (rose pink flowers), ‘Donald Lowndes’ (pink flowers) and ‘Darjeeling Red’ (red-pink flowers). We have the latter two in the garden at The Belvedere Centre and ‘Darjeeling Red’ at Grapes Hill Community Garden, where it is making an escape bid beyond the garden railings and softening the edge of the adjacent car park.

Persicaria amplexicaule is a much more robust plant, growing to 1.2 metres tall with large, prominently veined ovate leaves and small flowers borne in dense, long-stalked spikes which are up to 10cm long. It looks more like a dock than P. affine. It is happy in sun or part shade in reasonably moist soil.

Persicaria amplexicaule "Rosea"

Persicaria amplexicaule ‘Rosea’

Varieties include ‘Rosea’ (pink flowers), ‘Firetail’ (white – pink flowers) and ‘Inverleith’ (deep pink flowers, much lower growing – to about 50cm tall). In the Belvedere Centre Garden ‘Rosea’ has been in flower since late August and its flower spikes have proved very attractive to honeybees.

The Beth Chatto Garden website lists several varieties of Persicaria. Other species suitable for the garden include the spreading Persicaria microcephala ‘Red Dragon’, whose leaves are lance-shaped and purplish-green. The leaf centres are purple or bronze and there is silvery v marking around the edge of the leaf. P. microcephala “Red Dragon” has round clusters of tiny white flowers in late summer and autumn.

The annual garden weed known as Redshank or Persicaria is also in the genus – it is Persicaria maculosa. The name Redshank comes from its sprawling red-jointed stems. It has spikes of small pink flowers and grows on disturbed ground and is widely distributed in Britain (see map). It is edible in small quantities (see the Plants For A Future website for more data).

When I was learning plant names Persicaria maculosa was known as Polygonum persicaria. This was part of a bigger reclassification, as the genus Persicaria has been split from the genus Polygonum in recent years, leading to a number of name changes.

Update August 2014: I have since added a third Persicaria to my list of favourites, Persicaria polymorpha or White Fleeceflower.

Posted in General, Ornamental | Tagged Belvedere Centre, Grapes Hill Community Garden, Persicaria, Persicaria affinis, Persicaria amplexicaule

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