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Category Archives: Weeds

The Final Push

13 Wednesday Jun 2012

Posted by wellywoman in Cold Frames, Flowers, On the plot, Seeds, Vegetables, Weeds

≈ 10 Comments

Tags

cold frames, cut flower patch, Dahlias, scented flowers, stocks, zinnias

Cornflower

The sun shone on Saturday, after another week of heavy rain, giving me the opportunity to get up to the plot for the final push. This is the latest I have left the planting out of half hardies and tender plants. Often dictated by an upcoming holiday, I would normally expect to have empty cold frames by the start of June but not this year. Difficult weather conditions have meant a slow start to the growing season. Plants such as rudbeckias and zinnias are a quarter of the size they were this time last year.

Whilst some plants have struggled, it has been great weather for grass and weeds, unfortunately. Wellyman was on hand to tidy up the paths at the plot. With no strimmer and only hand shears to keep everything in check its a job neither of us enjoy but a trim every 3 weeks or so is better than leaving it and letting it get out of control.

Nigella damascena

Nigella damascena ‘Double White’ on the cut flower patch

I weeded the whole plot, which took an hour and a half. The ground was nice and soft after the rain making the weed removal easy. My problem weeds are speedwell, hairy bittercress and, in one bed, bindweed but none of them are too bad, mainly because I do as little digging as possible.

The last patch of stocks was removed. They had been such great plants, straggly looking things I’ll grant you, but they had been flowering since last October and had provided so many bunches of gloriously scented flowers, I’m slightly sad to see them go. They were finally giving up the ghost, though and I needed the space, so in their place are now some larkspurs and zinnias.

The plot in June

The plot in June

I managed to squeeze in two dahlias which I’d stored in the downstairs loo over winter. Potted up in April they have spent the last couple of months in the cold frame and have made good-sized plants, one is even about to flower. I have no idea which varieties they are, somewhere along the line their labels have disappeared. Still, it’ll be a nice surprise when they do flower.

The last plants went into the cut flower patch; cornflowers, gypsophila, rudbeckias and godetia. The plants were a little smaller than I would have liked them to be but I’m going to be away for a while, so they need to fend for themselves. I’m hoping I’m going to have enough flowers to take me through to October and for my first foray into the world of the horticulture show. If I can get myself organised I’ve decided to enter some flowers into one of my local shows. I haven’t decided which show yet or had a look at the schedules to see which class I’ll enter. See what I mean about needing to get organised.

Sweet Williams

Sweet Williams – I possibly didn’t need quite so many plants

Fortunately, the heavy rain and gale force winds didn’t do too much damage but some extra staking and tying in was necessary. The broad beans were now tall enough to pinch out the growing tips, this encourages the plants to divert their energy into producing pods and also helps to discourage black fly. Don’t put them on the compost heap though, they are really nice steamed – a bit like spinach but with a mild broad bean flavour.

So that’s it for another year, the seed sowing and plant nurturing frenzy of spring is over. I always feel like I can breathe a sigh of relief when the cold frames and window sills are emptied and the plot fills up with plants. But there’s little time to rest on my laurels as June is the perfect time to sow biennials. Better go and dig out my seed tins.

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The Weed Killing Plant

09 Friday Mar 2012

Posted by wellywoman in Weeds

≈ 18 Comments

Tags

Chiltern Seeds, Garden Organic, getting rid of weeds, Sarah Raven, Tagetes minuta

Tagetes minuta (image taken from metafro.be)

Gardeners everywhere understand how annoying and frustrating perennial weeds can be. For years people have turned to chemicals to solve the problem but as fewer chemicals are now available and more of us want to grow organically could growing a particular plant, Tagetes minuta, be the answer.

Annual weeds maybe the bain of a gardener’s life, especially in spring when the increasing light levels and warm soil mean they appear all over the place. However, a spot of regular hoeing is all that is needed to keep on top of these weeds.

Perennial weeds are another matter. Some, such as daisies and plantain are easily removed but the discovery of some perennial weeds can strike terror into the heart of a gardener. There is a sinking feeling when you come across ground elder, bindweed and, heaven forbid, Japanese knotweed. Most of us would probably turn to glyphosate, a systemic weedkiller, which means it travels through the leaves, into the main body of the plant, where it is transported through to the roots killing the whole plant. Although glyphosate is deemed to be a fairly safe chemical because it is broken down quickly in the soil, there is talk that it may be banned by Europe in the coming years and I think most of us would ultimately prefer not to use any chemicals.

So could this be where Tagetes minuta comes into it’s own. It’s common name, which I love is ‘stinking roger’ because of the smell given off by it’s leaves. A native of South America it is a half hardy annual which can grow up to 2 metres. It certainly isn’t a looker with tiny nondescript flowers but it’s what is going on in the soil that is important. Tagetes minuta exudes chemicals from its roots which repel weeds such as couch grass, bindweed and ground elder. This is a biological phenomenon called allelopathy, when one organism produces one or more chemicals which influence the growth and ultimately the survival of other organisms.

Tagetes’ ability to cleanse the soil was discovered by a bulb grower in Holland in the 1940s. After the bulb harvest and before he planted his next crop he grew some African marigolds (Tagetes erecta) to sell as cut flowers. He started to notice that land where the marigolds had been growing no longer had problems with eelworms, tiny worms that burrow into bulbs and tubers. Over the next couple of years he continued to clear strips and grow these marigolds, curing his soil of ‘root rot’. He told the local agricultural research team who studied the marigolds and produced a report which became known as ‘The Tagetes Effect’. The Henry Doubleday Research Association (HDRA), now known as Garden Organic, then took up the baton and started their own research to see if there were other members of the Tagetes family that could combat problems such as potato cyst eelworm. Their quest led them to South America where the first potatoes had been grown by pre-Inca civilisations. Land was limited with crops being grown on terraces. There wasn’t the space to rotate their crops and yet they had no eelworms in the soil and this was down to Tagetes minuta which had sacred status amongst these early people.

Working with Swansea University the Henry Doubleday Research Association discovered the 5 important compounds in Tagetes minuta and then a member of HDRA grew some in the hope it would also cure a wireworm problem. It didn’t, but it did clear the soil of ground elder. It seems that the same chemical compounds that deter pests in the soil also interfere with the life cycle of some particularly invasive weeds. Sarah Raven has recently used it to clear a bed of ground elder.

A note of caution however, Tagetes minuta itself is actually considered a weed in over 35 countries, including the USA. It is only a problem though if allowed to set seed which is unlikely if grown in Britain because it flowers late, in September/October. It could be used as a green manure, grown in an area with pests or weed problems and then cut down in autumn with the bushy green foliage being added to the compost heap. Chemicals released from the plant when touched can cause dermatitis so it is advised to wear gloves when handling.

Many of us have used members of the Tagetes family as companion plants for tomatoes to repel aphids but it’s fascinating to discover that plants themselves could hold the key for future ways of controlling pests and diseases.

Seed available from Sarah Raven, Chiltern Seeds and Nicky’s Nursery.

Information taken from The Ecologist Vol 2 No. 3 1972

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My latest book – The Crafted Garden

My latest book - The Crafted Garden

My latest book - The Crafted Garden

My Book – The Cut Flower Patch

My Book - The Cut Flower Patch. Available to buy from the RHS online bookshop.

The Cut Flower Patch – Garden Media Guild Practical Book 2014

The Cut Flower Patch - Garden Media Guild Practical Book 2014
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