The summer sun and warmth mean plants are growing apace and in the greenhouse the tomatoes are roof height. Once again the drip irrigation system, controlled by a timer, is working well and a few main crop tomatoes are ripe already.
What has proved very worthwhile are the early ripening tomato varieties in medium sized pots (9 litre). Though a bit small for a tomato plant they are quite adequate for smallish varieties, which are yielding around three trusses of super early fruit. Most surprisingly, fruit are ripening even on the plants that were cast out of the greenhouse in June. The earliest were Stupice followed by Bloody Butcher , Sub-Arctic Plenty and Glacier. This last variety is actually growing quite tall outside against a wall, with five trusses of fruit forming.
I am incredibly excited by the growth of my banana which was recently moved from a medium to an Extra Large Air-Pot. This started the season with one or two leaves but now looks like a proper tree with a real spray of exotic looking foliage, AND pups have formed! Four little offsets have sprung up around the main truck so this looks set to be a little banana grove in a pot.
I’m also rather pleased with my onion in a pot just because it is so perfect.
The crops-in-pots are mostly still growing apace but not quite ready to harvest. There are plenty of green tomatoes, some of them rather strange shapes, but not many ripe yet.
I am pleased with my onions and leeks in Air-Pot containers, they are bigger in these pots than similarly treated plants in the ground. Giant veg growers produce monster Air-Pot grown onions and this year Mark Shepherd is quietly confident of a world record.
Flowers are being produced in abundance, my agapanthus has filled out nicely and thrown up flower stems for the first time. It split its previous pot and seems to be much better now those vigorous roots are air-pruned.
My hydrangeas have put on a good display despite having been in the same rather small pots for three years. One edible that has just started to yield useful crops are the blueberries, and the mixture of varieties should continue to ripen right through August. The Air-Pot grown bushes have been in large containers since the beginning of the year and look set to crop very well. For the first time some will have to be preserved.
A pair of blackbirds have been helping themselves a bit too freely so nets have had to be deployed.
Even though we are well into June the weather has been wet, windy and cool at times. I am glad the tender plants such as squashes are still in pots in the greenhouse. I find many of the tenderest plants stay in good condition in a 1 litre propagation Air-Pot for a long time without getting potbound.
Sweetcorn barely ripens in a typical Scottish summer so getting plants to a good size early in the summer in the greenhouse really helps them along, The roots continually improve due to the air-pruning. The same is true for sweet potato, chillies and tomato.
Sweet peas have provided a really welcome bit of colour and sweet scent, they are blooming happily in a medium Air-Pot which means I can move it easily now it is in flower.
A Hosta which was divided a year ago has demonstrated the difference between Air-Pot growing verses a ceramic planter. The plant was split in two, one half went back in original pot the other into an Air-Pot of similar volume. Both had the same compost and growing conditions, the half in the Air-Pot now has twice the foliage and ten times the flowers.
An avocado I grew from a stone gathered in Madeira has produced massive healthy looking leaves, could we possibly produce a Scottish avocado fruit in a few years?
Even though we are still early in the growing season and frost is still possible in Scotland in May I am pleased to have harvested my first early potatoes. These were grown in an Air-Pot potato tower which I planted up in February and kept in an unheated greenhouse. Mid May is a good couple of weeks better than last year when we harvested at the very end the month. I know a second planting is possible in these containers but I thought I would try Sweet Potato for a change, this will be a real long shot in Scotland but it would be a great way to use the potato tower; super-early potato followed by Sweet Potato through the warmest months.
I have been getting good results using Air-Pot salad / seed trays. The broad beans germinated really well in an 8 litre tray, with no rotting as often occurs in the cold ground. I found the roots were easy to tease apart when the plants are about 15 cm tall and one tray gave enough plants to fill a 3 metre row with some spares.
An early sowing of radish has produced absolutely perfect little radishes which are being selectively picked to leave remaining plants space to bulk up, but the early thinings are so delicious the rest will not be around for long. A lovely clean crop with no slug damage or holes in the leaves.
The other pot I am using a lot at this time of year is the 1 litre propagation pot. These are currently filling up with assorted peppers, tomatoes, cucumbers and sweetcorn. The sweet potato plants have also been kept in them and are now ready to go into to 50 litre potato tower. Quite a jump; 1 litre to 50 litre, but that is an advantage of Air-Pot containers, there is no need for small increments in pot size, the roots will fill the entire volume of compost.
The worst of the winter is past, just about all the stored vegetables are eaten and there is not much to pick in the garden. This time of year used to be known as the Hungry Gap. Extra early crops are especially welcome as they shorten this gap, which is why I try to get a few potatoes ready a little earlier every year. Last year we opened an Air-Pot potato tower at the end of May and got a useful crop. This year I’m hoping to have some ready even earlier. The plants are already well grown in the greenhouse and should survive as long as horticultural fleece is thrown over them on cold nights.
Some ornamental perennials are coming to life including hostas in pots, I was amazed at the solid mass of roots of the old plant I saw when re-potting and dividing last year. After just one season the roots of the re-potted hostas had already completely filled the new pots and were following the pot walls in layers. So, a prime candidate to benefit from the air-pruning achieved in an Air-Pot.
Along with other vigorous rooted plants, like agapanthus, canna and banana, I want to see if air-pruning keeps them happier for longer in a pot. It seems logical that terminating the growth of roots by air-pruning, leading to more branched roots, is better than allowing endless circling and the roots growing layer upon layer around the side or base of a conventional pot. A couple of canna in little 3 litre Air-Pot did well last year and apparently these flower better when they are not over-potted, so they will stay in these for another year.Likewise the agapanthus is being contained by its Air-Pot, this had actually burst its old pot, the new leaf is looking lush. We will see how both these flower this season.
Also lush and pristine is the new growth of the chives, unlike plants which cope with constrained roots, alliums seem to respond well to rich soil and a generous root run and they like good drainage. So I’ve put a little self-seeded clump into a big Air-Pot, lovely Spring greenery close at hand by the back door and hopefully a good show of purple pom-poms this summer.
It is time to think ahead to the coming growing season and I have been moving some plants on to bigger containers. The blueberry plants put on a huge amount of growth last year and when opening up containers the roots have clearly filled their old pots.
Most will go on to the biggest Air-Pot containers, either Extra Large pots, or Potato Towers. With lots of ericaceous compost the plants should be happy for several years. All they will need is occasional removal of a old stems and lots of ericaceous feed. Blueberries are definitely one of the most financially worthwhile crops and unless your soil is naturally acid they will always struggle in the ground.
Another plant which has appreciated potting-on is a Carolina Reaper chilli which was looking a bit sickly in a 1 litre Air-Pot. Since going into a 3 litre pot just after Christmas it has put on some lovely glossy new growth and is covered in flowers.
This is the hottest chilli in the world so if it crops well I’ll probably have enough heat to keep the northern hemisphere warm next winter.
The winter beetroot experiment continues, this was just a fun winter planting to see how big a beetroot can grow in a 1 litre pot. The plants were kept in a grow tent under lights. The leaves are looking really healthy and the roots are swelling nicely, so they should yield a few super early beets soon.
Other early season plantings are onions, leeks and salads in trays, and potatoes in the big 50 litre Air-Pot potato towers; these can be kept in the greenhouse with fleece over the young shoots during cold nights. My stored potatoes are nearly finished so the sooner the super-early container grown ones are ready the better. Last year we had some at the end of May, I am hoping to have some by mid-May this year.
Things have slowed down in the garden, the greenhouse is clear of all the annuals and the pots mostly stored for next year, except for some chilli plants which apparently can over winter if kept in a frost free shed. They are looking good so far, I think partly due to the good drainage and aeration of the soil in the Air-Pot containers which avoids soil staying too wet.
A couple of Jerusalem Artichokes which I stuck in a pot in Springtime, I found had produced a nice little clutch of tubers. This was a very easy crop to grow and harvest, I simply opened the container in a wheelbarrow and picked out the crop, I understand it can be hard digging out every last piece if they are in the ground so this is a good way to stop them becoming a permanent fixture in the garden. The same is true of horseradish which yielded nice roots in a pot, I just wish I had done the same with my mint!
Just to liven up the winter months I decided to try and grow some beetroot in 1 litre Air-Pot propagation pots in my new grow tent under lights. Because the tent is inside the house which is a dry heated environment I really wanted the pots to be able to draw up water from below rather than rely on hand watering from the top. This is not normally possible with an Air-Pot due to the raised base unless you dunk the pot in quite deep water, and 2 or 3 cm of water will always remain in the tray or saucer below the base, this is not desirable as roots will grow into standing water. So I threaded a strip of capillary matting through holes in the base leaving two tails dangling down, this means that if I pour a shallow puddle of water into a tray it is quickly drawn up the wick into the compost and no water remains below. I find this keeps the compost in the pot well wetted right down to the bottom and I do not have to frequently lift pots to check they are moist enough. The plants look healthy and I already had a little picking of leaves to eat, very nice they were in a saag alloo curry.