HOW TO GROW GIANT CABBAGES
There is something almost magical about growing giant vegetables, and for those few who chose to do so, their techniques are often shrouded in secrecy. However, while there are undoubtedly a number of hard earned family secrets that you will never get to know about, the one thing that you can't do without is the seed. And not just any seed. The seed for growing giant vegetables would have been specially selected - often from a long line of show winners - from a lineage that can date back as far as the 19th century. The simple fact is that without the right seed your attempt at growing giant vegetables is likely to fail. However, should you be able to get your hands on the real worlds equivalent of 'Magic Beans' then you are welcome to try my cultivation tips for the perfect giant cabbage.
When it comes to growing giant cabbages you will find that you won't be able to purchase pot grown specimens, instead you will need to purchase seed from a specialist supplier and grow your own. You allow the plants to grow to their full potential will need to make the most of the growing season and this means sowing your seed under protection quite early on in the year, around about the beginning of February
Using a large, modular seed tray, fill with a good quality compost such as John Innes ‘Seed and Cutting’. Sow at a rate of one seed per module then lightly cover the seed over with the same compost, but this time pass the compost through a fine garden sieve first. Sit your prepared tray into a second – slightly larger - tray holding no more than an inch or so of water. Allow the water to be naturally absorbed into the compost until all of it is moist – you may need to add more water to the bottom tray in order to achieve this. You will know when the compost it saturated with water as the surface of the compost will change from a light brown to a dark brown colour.
After covering the seed with the fine compost give the surface a spray of water through a hand sprayer. This will ensure that the seed are not disturbed and keeps them at the same depth that you sowed them. At this point you can cover the seed tray with glass until the first seedlings emerge or give the surface a light spray of water on a daily basis or if it looks like the surface compost is likely to dry out.
Place the seed tray in a propagator to germinate or leave on the bench if your greenhouse is heated to a minimum of 50°F.
After the seedlings have germinated and showing two strong seedling leaves, transplant the seedlings into individual small pots or modules.
With giant cabbages, they must be looked after in order to achieve their optimum size and quality. Right up until they are planted outside, they will need to be re-potted on to a larger sized pot on a regular basis – at least until the weather has settled sufficiently to plant them out without the risk of damage from late frosts.
You also need to make sure that you spend adequate time in hardening off giant cabbage plants. Put them outside too early and you will not only risk physical damage to them but you can also cause a check to their growth. Start off by placing them in a ventilated cold frame during the day but remember to bring them back in over night. After a week or so - and when overnight temperature stabilize – you can eventually start to leave them out overnight in the cold frame. After another week they should be able to leave the cold frame altogether and be placed out into a sheltered area.
When it comes to planting you giant cabbages out into their final position, it is all about preparation Plant them in a well manured plot that ideally is free from club root disease. If you do have clubroot you can still achieve some really commendable heads by saturating the planting hole with a dilution of Armillatox made to the manufacturer's recommended strength. Before planting, liberally dust the hole with lime.
To get really the large heads on your giant cabbages you must give them ample room for development, it’s no use at all planting them out a foot apart and eighteen inches between the rows, as they will not be able to achieve a large enough size. Ideally and for the really big sized heads, they need to be at least a metre apart and likewise between the rows. When they are planted out initially this sort of spacing will look a bit ridiculous and your young plants will appear lost on the soil when your giant cabbages really start growing in earnest, you'll be struggling to work your way in between them.
GROWING TIPS. One of the key things to growing giant cabbages is plenty of Nitrogen, they need it in order to produce the huge amounts of large sized leaves. Regularly use a high nitrogen liquid feed, particularly during the initial stages to start the plants on the road to giant-dom. Regular watering is just as important, particularly if you are growing over a hot summer. Forget to feed and water and your crop of giant cabbage will end up as just another crop of greens.
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