What's The Weather for Salad?

NB I'm using that sparkly gold notebook to record everything and make notes about my 52 Week Salad Challenge :)

I've been looking into my local climate data this week to get an idea of when I can sensibly switch from indoor growing to outside. Previously I've found I can usually grow plenty of salad for us from April/May to October/November depending on how the weather's doing in a particular year.

I've looked at the Met Office website and printed off the 1971-2000 average climate information for my local area. I printed both the Lyneham and Boscombe Down weather station data because whilst Lyneham is the closest, it's quite a bit higher than where we are. In reality it turned out there's little to choose between them.

Many of our salad crops, particularly lettuce need 100C in order to germinate and will have some growth from around 50C. Therefore these are 2 key temperatures to look for in the climate data. I also looked at which months don't have an air frost on average because this gives an idea of when crops can be safely left without any protection.

From the data I found on average:
  • Months max temperature exceeds 50C: All year
  • Months min temperature exceeds 50C: May-Oct
  • Months max temperature exceeds 100C : Apr-Nov
  • Months min temperature exceeds 100C: Jun-Jul
  • Months with no air frost: Jun-Sept (and May and October have less than 1 night's air frost on average)
From this information I can see:
  • There is the potential for outside growth most if not all year - albeit this will be limited in the winter and crops will need protection
  • My ability to grow crops outside from April-May to Oct-November fits with when the average maximum daily temperature exceeds 100C. Also, seed sown outdoors at this time will germinate - indoor or protected sowing is needed in the other months
  • I can confidently grow without protection from June until September and take a little risk in May and October (though perhaps I should be on standby with the protective fleece just in case!)
Therefore it's a while yet before I should be sowing outdoors, but sowing indoors now means I'll have plants ready for when conditions are right for them in April/May. Autumn sowings will give me some salad over the winter which I can supplement with sprouted seeds/microgreens/pea shoots. It means I can build on the success of my personal salad challenge next winter and buy even less bags of salad than I've done so far :)

Of course the data I'm using only gives the average climate information. What our weather actually does is a completely different thing!

As well as temperature, light is an important growth factor. Its quality has been noticeably different this week: it's felt like the sun is shining on me rather than at me. So I also looked up the daylight hours information for nearby Bath. Yesterday was the first day we've had 10 hours of daylight since the 25th October last year. That's a good enough starting signal for me to commence indoor salad sowing in earnest this weekend :)

I hope this information is helpful for you to find out the potential length of your indoor/protected and outdoor growing seasons for where you live. NB next week is our second Salad Days gathering, so get ready with your salad blog posts to add to next week's Mr Linky.

If you have an interest in the weather - and what gardener doesn't - you might like to check out my ABC of Weather series.

How's the weather (or climate) with you for your salad growing?

Update: Mark at Vertical Veg has found a website which does all the hard work for you re frost dates. However, it's still worth checking to see if the Met Office has a weather station closer to you. The nearest site on the link for me is Bath, which has a slightly different climate to the Met Office data I've used.

Comments

  1. Lu17 February 2012 at 19:09

    very interesting - I'm glad you have looked all that up so I don't have to!

    ReplyDelete
  2. Elizabeth Musgrave17 February 2012 at 20:53

    That is just the kind of information I find fascinating but never get round to digging out for myself! thank you.

    ReplyDelete
  3. VP18 February 2012 at 14:21

    Lu and Elizabeth - it's all part of the service!

    ReplyDelete
  4. BrittanyGirl21 February 2012 at 13:18

    I have presented you with a Versatile Blogging Award. See the details on my blog http://livingin22.blogspot.com

    You can see what you need to do now!

    Sandra

    ReplyDelete
  5. VP26 February 2012 at 19:37

    Thanks Sandra :)

    ReplyDelete
  6. petoskystone3 March 2012 at 03:07

    How organized you are! The weather is so screwy around here...very chilled drizzly rain off & on all week (but nary a tornado, thankfully).

    ReplyDelete
  7. VP6 March 2012 at 11:59

    Petoskystone - glad to hear you're safe. The tornados have started early this year haven't they?

    ReplyDelete

New comments are not allowed.

Your essential reads

That blue flower: A spring spotter's guide

Image
Spring is a prime time for blue flowers and my daily walks currently have several from the same plant family* lining the local footpaths. As I walked past the Donkey Field the other day, I overheard some children ask their parents** what the pictured blue flower was. It reminded me it's often mistaken for those other familial blues and this time was no different, as they said it was forget-me-not, instead of the green alkanet it actually is. As well as similar flowers, most of these plants are hairy in their nature, flower around the same time, and favour damp, shady places. Many of them are great for pollinators too, especially bees and this week's warm weather has certainly drawn them to these flowers. This makes it even more likely for these plants to be mistaken for each other and it's a great opportunity for me to put together a spotter's guide in case you find the same flowers on your outings. Staying with green alkanet, the key features which set it
Read more

Jack Go To Bed At Noon

Image
Last year this rather exotic looking flower appeared on mine and several other allotments for the first time. Having been stumped (again) by Mr Allotment Warden as to its identity, I rushed home to find out what it was. It's salsify, aka the marvellous Jack Go To Bed At Noon - named as such because its flowers always close by midday. Here you can see both open and closed flowers - making it seem even more exotic and alien than in the first picture. I think this must be the cultivated version because the flower in my Francis Rose Wild Flower Key looks exactly the same in form, but is bright yellow in colour and called meadow salsify . Its other common name is Goatsbeard, which must be a nod to the fantastic dandelion-like clock which forms the seed head. With 'parachutes' like those shown above, who knows how far our plotted plants came from. I rather like the photographic dissection of the seedhead found in this link . Salsify is edible: its lateral shoots and fl
Read more

Red Nose Day - Gardening Jokes Anyone?

Image
The nation goes ever so slightly bonkers on Red Nose Day - hurrah! Previously, it's been very easy to join in - usually via a dress down day at work plus lots of people up to mad things at the station and in the office. Everyone smiling for once - it's a real feel good day and all in a good cause. This year's different - every day's a dress down day for me now - my friend L suggested yesterday that perhaps I could have a dress up day instead and whilst that's a good idea, I confess that ballgowns and tiaras don't really feature in my wardrobe: scruffy student's always been my favourite look. So my Red Nose Day contribution for this year is to compile a list of gardening related jokes. For each one (clean ones only please) you leave in the comments below, I'll make a donation of 50p to the cause. Here's a few for starters just to get you warmed up: Q Why do potatoes make good detectives? A Because they keep their eyes peeled. Q What did the grape
Read more

Salad Days: Mastering Lettuce

Image
I've decided one of my salad challenges for this year is to grow as many lettuce varieties as I can, ready for the publication of my planned Factsheet* later on. The idea is to grow as many of the Tried and Trusted lettuce varieties last year's Salad Challengers helped compile, then provide a visual guide and as many lettuce facts as I can muster. So far I've found around half of those listed**. Then naturally whilst I was out searching - because such is the way with seeds - a number of other varieties found their way home too ;) A couple of weeks ago I sowed 22 varieties***. Just the simple act of sowing them has me intrigued. Why are some lettuce seeds black and others white****? They split into about half white to half black in my sample and as far as I can tell it's nothing to do with whether they're a type of cos, iceberg, or whatever. I sowed them indoors and popped them into a propagator on the windowsill. The soil's too cold outside for sowing
Read more

VPs VIPs: Derry Watkins of Special Plants

Image
Last week I had the pleasure of visiting Derry Watkins at her home, garden and nursery - the acclaimed Special Plants - just a few miles along the road from me. I first met Derry at one of her open garden days last year and was keen to find out more about her wonderful garden and running an independent nursery. She specialises in tender perennials and regularly goes on plant hunting trips to find new treasures, particularly in South Africa. As well as running Special Plants and opening her garden under the NGS scheme , Derry holds day courses at her nursery, hosts Special Tuesdays from April until September, lectures and has written a couple of books. How did you find your way from Connecticut to the UK? I'd started a biodynamic vegetable garden in Connecticut and we used to have people come along at weekends to help out. A particular young man turned up: he returned many times and at the end of the summer I married him. So it was all down to love? Isn't that the
Read more

#mygardenrightnow: heading into summer with the Chelsea Fringe

Image
Ahhhhhh, that's better! I love walking through dewy grass in bare feet, not that there's much in the way of grass on my back lawn this weekend. My wild and woolly lawn has morphed into meadow of sorts this month, which even NAH admits looks attractive*. It's also proved a great source for my Flowers for mum project so far, yielding self-sown perennial cornflowers, lamb's ears, and lemon balm in addition to the blooms you can see. These originated from elsewhere in the garden, the ox-eye daisies must have blown in from the A350 nearby. * = he got very stroppy about the weeds aka self-sown foxgloves in the lawn one year, so he's come along a bit since then. Skimble's demanding to say hello to you too. He does enjoy the patio when it warms up. If the embedded video doesn't work try this link instead. The Nectaroscordum are a revelation. I planted the bulbs around 2 years ago, but it's only this year they've bloomed properly. The bee
Read more

The Resilient Garden

Image
  Part of Tom Massey's Resilient Garden at RHS Hampton Court I've been pondering VP Gardens a lot lately. Last year's drought conditions set me off initially, then our harsher than usual winter combined with this summer's flip and flop weather means the thinking continues. It's a huge topic which I freely admit I'm struggling to get my head around. Tom Massey's Resilient Garden  at Hampton Court recently  tackled this topic brilliantly and was a timely interlude which gave me much food for thought. There he encapsulated the detailed research he'd found which informed both his show garden and book of the same name. I think it's one of the most important show gardens I've ever seen. It's clear the way I garden needs to change so that I have my own resilient garden. I haven't worked out the exact details yet, but Tom's book plus a couple of others (see below), alongside the rainwater management handout from the show garden's  sponso
Read more

Testing Times: Tomatoes

Image
  I've run a couple of tomato trials this year. The first is a revisit of the biochar trial with Oxford University I attempted some years ago (with a different organisation this time), and the second is a trial of a water gadget called Plantsurge which I was given to try at Malvern Spring Show earlier this year. Most of you have probably heard of biochar already and the claim that this inert, carbon-rich material can help soil fertility and plant health. The RHS information in the above link says results can be mixed, with reduced effects found in alkaline soils. This may help to explain the lack of difference I found in my previous trial as VP Gardens is on a lime-rich soil. Plantsurge is a different beast altogether. It's a strong magnet which is attached to a hosepipe as shown in the photo above. It's claimed that it softens water, with the result more like watering with rainwater. The higher nitrogen found in rainwater is thought to be beneficial to plants. Gardener
Read more

Chelsea Fringe 2014: Shows of Hands - Episode I

Image
The gloves NAH used to build the raised bed . The effects are L to R, top to bottom:  Original photo, Warhol, HDR, Green tint, B&W, Posterize, Boost, Cross process and Sepia Welcome to Shows of Hands - my Chelsea Fringe project for 2014! As you can see I've been having a bit of a play around in Pic Monkey for my first contribution. You're welcome to join in between now and 8th June 2014. The idea behind this year's project is to highlight the tool most precious to a gardener: their hands. How do I take part? It's simple. All you need to do is take a photo of hand(s) in a gardening context and then share it via your blog or other social media (such as Twitter or Facebook), then make sure I know you've done so. I've set up Mr Linky below for your blog contributions. The Chelsea Fringe photo on the right sidebar links to this post, so you can easily find it again when you're ready to add your contribution. If you share your photo on Twitter,
Read more

Make Use of Mildew

Image
On my garden patrol this morning I spotted some powdery mildew on a couple of my new Verbena bonariensis plants. I suppose it was almost inevitable as I prefer to grow my plants hard - this means no water for them unless they look absolutely desperate. This approach means plants root themselves more deeply and have a better chance of survival during spells of dry weather like we've had lately. However, it also means I run the risk of problems like today's, especially with any garden newbies planted late in the season. We've had a good drop of rain overnight, so this should help my plants survive. I'll mulch them later today to help lock in the moisture as it's water stress which encourages the mildew to take hold. I've also removed the infected leaves and sprayed the rest with a milky drink.* I'm also pleased to find there's a use for my infected leaves. Oliver Ellingham at Reading University has started a PhD - sponsored by the RHS - researchi
Read more