Silverbeet

Silverbeet (Beta vulgaris) is an easy to grow leaf vegetable.  Silverbeet is also called chard, swiss chard, rainbow chard, leaf beet, perpetual spinach, and beet spinach.   

When I was a child (and in some parts of Australia today) this vegetable was mostly called 'spinach'.  Silver beet is not closely related to true spinach (Spinacia oleracea).  They are used in similar ways, but they are very different plants, they grow, taste, and look different. 

Coloured silverbeet mix

Like many leaf vegetables, silverbeet is reasonably nutritious.  It is particularly high in vitamin K.  Ten grams of raw silverbeet leaf contains the recommended daily intake of vitamin K.  

Like many vegetables, silverbeet contains some anti-nutrients, in this case it is oxalic acid.  It is not overly high in oxalic acid, and it is usually eaten cooked (heat somewhat degrades oxalic acid), so this is not a big issue.  Some people eat raw leaves in salads, given the relatively low amount of oxalic acid present in the leaves and the small amount of leaves generally eaten, this isn't an issue for most people. 

Much genetic diversity among my silverbeet

Many years ago we bought a pack of silverbeet seeds.  It was a coloured mix and the seedlings grew various coloured petioles (leaf stems).  I liked the look of the yellow ones.  For some reason the yellow ones were always less vigorous in my garden, but I like the looks of them. 

I allowed them to self seed indiscriminately, and we always had some silverbeet of various colours.  We moved house and I took some seeds with us, then I forgot about them.  A few years later I thought about growing silverbeet again and had plenty of seeds that were about ten years old.  I planted a bunch to see if they would work, figuring I could buy more seed if needed.  

Most of the seeds did nothing as they were too old, but some grew, and we have had silverbeet growing ever since.  

Not a great photo: white stem on left, green stem on right

Each year there are different colours in the garden.  A few years ago most had light green stems, I like the look of them.  

This year there are no yellow ones, but we still have red, a vibrant pink that I cannot capture the colour of in my photos, white, and light green.  The leaf is always green, some dark, others light, and over winter some turn purple/reddish green.  

  

Various stem colours

Silverbeet is often considered to be a biennial, They grow one year and they flower and die in their second year.  Given the right conditions many silverbeet plants probably are biennial.  For me some are annuals, they grow, flower, and die in under a year.  Some are indeed biennial, growing one year, then in their second year they flower and die.  Others are short lived perennials, in my garden they survive 4+ years before flowering.  

Silverbeet is the same genus and same species as beetroot, mangelwurzel, and sugar beet.  All of these plants can and will cross readily, so care needs to be taken if seed saving.  

All of these can be grown side by side without affecting the taste of each other or the colour of neighbouring plants.  Growing them next to one another is only an issue if you are allowing them to flower and are planning on collecting seed. 

Pink stems from same plant - far prettier in real life

Beetroot was selected for its large sweet and tender root, mangelwurzel was selected for larger root and leaf, sugar beet was selected for high sugar content, and silverbeet was selected for leaf production.  I find beetroot goes woody and my chickens won't eat it once it grows large, whereas my hens eat every last scrap of mangelwurzel no matter how large and old it is.  

If seed saving, all of these beets will cross pollinate readily.  The plants produce ample pollen that is spread a long distance by the wind.  

I have crossed beetroot and silverbeet a few times, the result is usually a plant with a tiny bulbous root, and produces fewer, smaller, and slightly sweeter leaves than silverbeet.  I am told that crossing silverbeet with sugar beet results in plants with large and tasty leaves.

Various red and pink silverbeet

Seed saving and breeding of silverbeet can be a little difficult and takes a lot of time and garden space.  As mentioned, individual plants can be annuals while many are perennial or biennial.  This may be influenced by environment as well as genetics.  Stress seems to induce flowering, so if you have a nice perennial plant you may be able to stress it into flowering.  Being wind pollinated means your plants may cross if your neighbours are also growing some of this species.

As you can see in the photos, my Silverbeet has a lot of genetic diversity.  I think this is a good thing and try not to create a genetic bottleneck.  Some years I see more diversity than others, this is because it has some recessive genes as well as genes that are only expressed when in the right combination.  

I have always thought about breeding something spectacular with it, but have never gotten around to it.  I tend to just cull things I dislike and allow the ones I like to flower and drop seed.  There are also some that grow in out of the way places in the garden or lawn, which I often allow to flower and seed.  

I have a few plants that have very wide petioles, these look interesting but we don't use petioles much, and my chickens are reluctant to eat these thicker stems.  I had some plants a few years ago that were twice as wide as this, they were short plants that produced little leaf and had extremely wide white petioles.  I culled them.  I probably won't allow these wide petiole silverbeet to flower.  Then again, I may leave one just to keep the diversity in the mix. 

Thick petiole vs thin petiole

I like the bright yellow ones, but they were not as productive in my garden so are slowly disappearing from my mix.  I don't have any bright yellow ones this year, but they may reappear next year.  As much as I like the looks of them, if they are less productive I won't grow them. 

I don't love the looks of white stemmed ones, I prefer the look of light green.  Presumably white is more vigorous or something as that is the most commonly seen in shops, I just don't love the look of it.  In my garden the light green ones seem pretty vigorous. 

The red ones can be very pretty, and my red ones may have some beetroot genes in their heritage.  Many of these are very productive and vigorous.  Some of these will be allowed to set seed.

This year there are some vivid pink plants that I cannot really capture in photos.  I plan to allow them to flower and set seed.  I don't have many of the vivid pink, but they seem to produce well.  I hope I get more vivid pink in future generations.  It wouldn't be overly difficult to bag them and collect self pollinated seed, but I have a feeling that I won't get around to doing that this year.  

Silverbeet grows well over winter here, and provides nutritious and large leaves that we eat as well as feeding to our chickens.  Having some greens over winter is good for the hens.  Silverbeet also grows reasonably well over summer, but needs some water to prevent wilting.  

When my current plants set seed I may collect and offer some for sale through my for sale page.  This will be a mix of colours, and it has been open pollinated, so I can't guarantee what colours you will get.  

My plants probably have some beetroot in their heritage, but are not likely to produce fat roots.  Coloured silverbeet is not rare, and is certainly not difficult to grow from seed, so if I don't have seeds you should be able to find seed for sale somewhere.  You could buy seedlings, but for the same price you will get a lot more seed with a lot more interesting colours.  Seedlings tend to sulk after transplant but pick up if cared for, and seeds grow so easily, so either is a good option to grow these.  Once you have them in the garden, it isn't too difficult to allow some to flower and set seed when the time is right and ensure a continual supply of this vegetable.