My recent foray into raspberry cane maintenance goes something like this….I laughed….I cried…..I laughed….(and now I’m holding my breath). But here’s the full story:
As many of my past blogs have focused on some of the more challenging aspects of the garden here at Craignish (a national collection of horsetail, ancient shrubberies, and out of control bamboo, to name but a few), I thought it was time to redress the balance and highlight one of the garden’s sweet spots, so to speak.
When we collected the keys in late summer 2010 and wandered through the garden, we were delighted to find four 18ft rows of established raspberry canes; some summer, some autumn fruiting. The rows were supported by a fixed framework of wooden posts and rails and a serious pile of fruit cage netting sat in the corner of the garage. It wasn’t hard to come to the conclusion that the previous owner was a serious officiando of Rubus ideaus.
I unfortunately am not; none of my previous gardens being large enough to provide space for fruit canes. So my great delight at discovering the canes covered in fruit, was matched by an equally great sense of foreboding that I was out of my league. Sure enough last October after a year or so of borderline neglect the BND were compelled to share the observation that the 2011 yield was pretty meagre in comparison with previous years.
Up until that point I’d been pretty happy with the harvest which had been enough to make a few batches of raspberry and rosemary vinegar, fill some freezer bags and make some awesome jam (which the Prof horded like Armageddon was imminent), all despite the fact that the hens and garden birds were at them incessantly. But apparently this was nothing compared to previous years when the canes were literally dripping with fruit.
Suitably chastened I added ‘learn about raspberries’ to my to-do list. While browsing the Loch Croispol bookshop in Durness during the late August bank-holiday (think driving rain, hurricane strength winds and single digit temperatures) I stumbled across a 1954 book that looked perfect for this quest ‘Soft Fruit Growing for Profit and Pleasure’, No.19 in the Burke’s ‘Help Yourself’ series. Originally costing 2 and 6, I paid a reasonable £1.00 for this little pocket-size treasure.
The concise section on raspberries told me all I needed to know. Cut autumn fruiting canes to the ground in late winter, and for summer fruiting varieties cut out the canes that have borne fruit already, leaving behind a fan shape of 6 or so canes of new growth to provide the new season’s berries. In the spring feed the canes with 2oz of potash and 2oz bonemeal per yard and provide a nice top dressing of compost or well-rotted manure. In February trim off the top of the canes just a few inches above the top support.
It didn’t sound too complicated and having ordered potash and bonemeal from the Garden Organic catalogue, I set aside some time at the weekend to get underway with some long overdue maintenance.
Old canes were cut out (revealing slumbering ladybirds in the process) and neatly stacked, only to be requisitioned by a den-building Minkey. As her shelter will likely be demolished by the wind tonight (it’s howling down the chimney as I write), I’m left wondering what to do with the old canes. Any suggestions?
I’ve been remiss about pruning the summer fruiting canes in late summer, but luckily it’s never too hard to tell the dark fresh canes, from the old ones. 
It took a few hours but finally the raspberry patch was looking pretty good and I was laughing. 
So having pruned, thinned, fanned and secured, I hoed in a light feed of potash and bonemeal (I know it’s not really Spring yet but I’ve got a lot to do this year and wanted to get this off my list) and then top-dressed with mushroom compost from a steaming hot pile by the garage. But WAIT I hear you cry…..mushroom compost is the last thing you want to put on soft fruit. It goes without saying that it’s here that the crying started.
Why I decided to read up on mushroom compost after applying it to the rasps is beyond me, but I did and of course immediately realised what a major pickle I was in. Mushroom compost is usually very alkaline, with high levels of chalk, soft fruit on the other hand prefers a more acid soil. I had lovingly and unwittingly covered the canes with their worst nightmare.
So I was back out this morning raking and brushing away as much of the mushroom compost as I could, fretting over the wasted time and worrying about the damage I had wrought. A quick call to the RHS hotline led to the suggestion that I test the Ph of my soil (and the compost) before getting more worked up than necessary. I had done a test when we arrived and vaguely remembered a Ph level just on the acid side of neutral, but wasn’t entirely sure. As my soil test kit wasn’t to hand (i.e. the potting shed is in serious need of spring clean) I decided to try some basic science to determine the soil Ph.
Alkalinity can be tested by adding vinegar to a sample of soil in a container – if it fizzes on contact then the Ph is high and the soil is alkaline. Conversely if water and baking soda cause fizzing when added to soil then the sample is acidic. When I added vinegar to the mushroom compost it was practically bubbling in the pot – plink, plink, fizz! The baking soda test on the garden soil was less dramatic but a faint fizz was audible, backing up my recollection of slightly acidic garden soil.
So while the top-dressing of mushroom compost was ill-advised, it hopefully won’t do too much harm, at least not as much had the soil been neutral. That said I’m probably going to source some peat-free ericaceous compost to try and redress the balance. Hopefully by harvest time I’ll be laughing again. What a weekend!
Raspberry (Rubus ideaus)
Raspberries have a long history of use in herbal medicine but it is the leaves rather than the fruit that have taken centre stage in this regard. The leaves are an astringent (tightening and toning tissue) and have been used traditionally as an aid to childbirth. Interestingly raspberries are sometimes known as ‘hindberry’ as female deer would feed on the leaves before giving birth.
In addition to its use in helping labour and milk production, raspberry leaf is also known as a remedy for diarrhoea, a gargle for sore mouths, and a wash for external wounds. A raspberry leaf tea can be made with fresh or dried leaves, but should always be taken under the guidance of a herbalist when pregnant.
But let’s not overlook the fabulous fruit, which taste an awful lot nicer than the leaves and were also appreciated for their health benefits. The English herbalist John Parkinson wrote in 1629 ‘The berries are eaten in the Summertime, as an afternoons dish, to please the taste of the sicke as well as the sound”.
A syrup made with raspberries was used to treat fevers and The Little Herb Farm’s raspberry and rosemary vinegar is based on an old Victorian recipe for a fruit shrub. Shrubs were taken as health tonics and I add mine to a glass of hot water when I’m feeling under the weather. I may be biased but I can heartily recommend it.