WILLOW BARK

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Willow bark

Willow bark is a herbal preparation that’s available over the counter in the form of tablets. Its active ingredient, salicin, reduces the production of pain-inducing chemicals in your nerves. Limited evidence suggests that willow bark may have a moderate effect in treating pain caused by osteoarthritis and rheumatoid arthritis. In the single study testing it against a non-steroidal anti-inflammatory drug (NSAID) for osteoarthritis, it wasn’t as effective for pain relief.

  • Family: Herbal medicine of the willow (Salicaceae) family
  • Scientific name: Willow
  • Other names: Salix spp., basket willow, bay willow, beta-salicin, black willow, brittle willow, crack willow, daphne willow, populin, purple willow, salicin, salicortin, salicoylsalicin, salicyl alcohol, salicylate, salicylic acid, salicyluric acid, salidroside, saligenin, salipurposide, Salix alba, Salix daphnoides, Salix fragilis L., Salix pentandra, Salix purpurea, white willow, white willow bark, willow tree, willowprin

The bark of some species of Salix trees has been used for treating inflammatory and arthritis-related conditions since ancient times. Extracts from the following species of Salix trees have been used as sources of willow:

  • Salix purpurea (purple willow)
  • Salix fragilis (crack willow)
  • Salix alba (white willow)
  • Salix daphnoides (violet willow)
  • Salix pentandra (bay willow).

These Salix species are also considered the natural source of acetylsalicylic acid, also known as aspirin. You can buy willow bark capsules from UK-based internet sites.

White Willow

Famous as the original source of salicylic acid (the precursor of aspirin), white willow and several closely related species have been used for thousands of years to relieve joint pain and manage fevers. White willow is the original Aspirin, and has the same indications as its synthetic counterpart. Where these two compounds differ though, is that white willow is milder on the stomach lining than is Aspirin and has a reduced anticoagulant action. It has a very bitter and astringent flavour, especially when fresh.

An infusion of the leaves has a calming effect and is helpful in the treatment of nervous insomnia. The leaves can be used internally in the treatment of minor feverish illnesses and colic and in the treatment of rheumatism, arthritis, gout, inflammatory stages of auto-immune diseases, neuralgia and headache. Try adding this herb to the bath water, the infusion is of real benefit in relieving rheumatism.
The active compounds in white willow, called salicylate glycosides, work as an effective anti-inflammatory by interfering with pain transmission in the nervous system and by treating the cause of inflammation.

The benefit of using white willow is that reduction in non-steroidal anti-inflammatory drugs (NSAID) is achievable, and that they can still be used to reduce pain as required.

Growing white willow:
The plant’s rapid growth and wind tolerance make it a very good pioneer species to use in establishing woodland conditions in difficult sites. Spacing cuttings about every 5 metres will soon provide shelter and a suitable environment for planting out woodland trees that are not so wind tolerant. The main disadvantage in using this species is that the roots are far-ranging and the plant is quite greedy, so it will not as much effect as species such as the alders (Alnus species) in enriching the soil and thus feeding the woodland plants.

Asking for trouble

Alchemilla mollis is particularly good at getting into cracks, and has successfully fringed the paving along my shady front border. That done, it needs curbing but, being bulky and conspicuous, it is easy to remember to shave it to the ground as soon as its froth of lime-green stars starts to fade, and so prevent a new deluge of youngsters. It then bounces back with new leaves for the second half of the summer.

Plants that colonise by underground runners are potentially even more of a headache, because they can have thoroughly infiltrated neighbouring plants before you have cottoned on. One of my most disastrous introductions here, years ago, was the creeping bamboo Sasaella ramosa (formerly Arundinaria vagans). I admired it in the parrot aviaries at Chester Zoo, and acquired a bit. I failed to realise I needed the parrots, too. Only their constant chewing can hope to keep it in check. In the end we had to lift yards of paving slabs to find its secret lairs.

I think I may have made another mistake introducing Clerodendrum bungei into the border. This is a fabulous late-summer performer with huge, domed flowers that are bright pink and sweetly scented. I knew it was a runner, but thought I could control it. But it is already 10ft down the border among the agapanthus. I should have isolated it somewhere between a path and a sunny wall. At Dunham Massey in Cheshire, it is well partnered with another thug, the white-flowered tree poppy Romneya coulteri. The two battle it out at the edge of a shrubbery, and the contrast of their leaves, one oval and purplish and the other grey and finely cut, is very good.

Orange Euphorbia griffithii ‘Fireglow’ certainly needs monitoring, but if you are looking for a neighbour that will put up with its questing roots, I can recommend Phlomis russeliana. This is a herbaceous version of Jerusalem sage, and has whorls of creamy yellow flowers above big heart-shaped leaves. I have ‘Fireglow’ blazing right through it, but it doesn’t seem to object in the slightest. As ‘Fireglow’ starts to fade in June, I chop down the stems and the phlomis flowers take over. The two have been co-existing happily for at least eight years.

Because a species has a bad reputation, it doesn’t mean all its variants are dangerous. For instance, no one in their right mind would introduce the wild pink rosebay willow-herb into the garden, but the white form, Epilobium angustifolium var album, is a great July beauty and not nearly as invasive – at least on my heavy soil. (Plants can behave differently in different conditions.)

Nor have I encountered any problem with the variegated ground elder. I wouldn’t plant it in a border, but under a hedge it is a very well behaved and handsome ground cover. Yet common ground elder, as you know, is the prince of terrorists. If you are confronted by it, you may be interested to know that experiments conducted in Germany have shown that over time the invasive (but easily extracted) yellow-flowered, variegated dead-nettle Lamium galeobdolon subsp montanum ‘Florentinum’ (‘Variegatum’) is capable of smothering and eradicating it for you.

Rogues’ gallery

Plants that need watching: (R) runner (S) seeder

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