High density growing II

The plants in the bus tub ebb and flow system are still in the root development stage but are doing well also. They are receiving about four hours of direct sunlight each day with indirect light for the remainder of the day.
The TDS is about 1000 with a pH of 6.5, however, I can see by the daily reading that the plants are taking in more water than nutrients. I expect to see more growth when the nutrient level begins to drop. Time will tell...

Hydroponic Swiss Chard II

As of the 17th. the chard is still in the root development stage, but is making progress. I expect to see much faster growth when the roots begin poking out of the container, which should mean that it is entering the vegetative stage.
The TDS has been increased to about 1800, which is a little high, but should still be acceptable. The pH is just slightly under 7 and this should be ideal for chard.

Mini herb garden

The above photo shows my hydroponic science project planted with parsley, basil and dill. If you can provide sufficient light to this system you could also grow small flowers like dwarf zinnias or asters.

Hydroponic Science Project

This small system can be assembled in a few hours and would make a great school science project.

It consists of a small storage container the size of a shoe box, an airstone and tubing purchased in the pet section, and six 2" net pots. The 2" net pots can be obtained from a local hydroponic dealer, or purchased online. I use expanded clay pellets and rockwool for the media, but washed pea stone would also work if the stones are large enough not to pass through the net pots.

The container was painted black to prevent algae from growing in the nutrient tank and a circle cutter was used to cut the holes for the net pots. The container holds about a gallon of nutrient mix, which should reach to the top opening in the net pots.

The only other requirement is a small air pump to aerate the nutrient mix. Aerating the mixture provides oxygen to the plants and helps prevent nasty organisms from growing in the nutrient mixture.

Three of these units should fit under a standard 48" fluorescent fixture. I would recommend one warm white and one cool white tube be used in the fixture. The fixture should be suspended three or four inches above the top of the plants.

I have grown leaf lettuce and herbs successfully in this system.

Hydroponic swiss chard

Swiss chard is one of my favorite greens and I hope these are a success. Again, I will try to remember to photograph and post a photo each week.
The chard is in a deep water culture system and I am running the TDS about 1600 and the pH at 7. Chard likes the pH slightly higher, and needs lots of nitrogen. It can stand night temperature as low as 29 degrees, but I don't intend to let the temperature get that low. I am venting the greenhouse during the day so the temperature does not get above 80 degrees, and hopefully the warmth will encourage rapid growth.
This variety is Fordhook Giant and I have not grown it before. I have grown rhubarb and early brights under lights, but I wanted to try the giant variety in the greenhouse.

High density growing

Above is my bus tub ebb and flow system and there are fifteen plants under cultivation in this small tub. I will try to remember to photograph the tub weekly and post a photo to track the progress of the plants.
As of today I have not had to use the grow lights at all, as the plants remain in the greenhouse. It was necessary to use a small oil filled electric heater on two nights because of frost, however, I feel I am still way ahead in terms of the cost of running the lamps 14 hours per day.
This is really my first attempt at growing this late in the season in the greenhouse and I am excited to see how it compares to growing under lights. Because the greenhouse is shaded by trees, it does not receive full direct sun until noon or so. The temperature can vary thirty degrees on any given day depending on the nightly low temperature. This afternoon it was a very comfortable 79 degrees with relative humidity about 40%. As I am mostly growing lettuce and herbs, this range should be acceptable.
There are three tomato plants still growing in the AutoPots, and I have been picking a few ripe fruit every few days. It is almost mid-October and tomatoes are selling at $1.79 per pound in the market, and they don't taste as good as my tomatoes, so I consider my tomato growing a success. We picked our first tomato on July 4th., and we are still picking tomatoes in October.

Using hydroponic gardening theraputically

When I first began hydroponic gardening my rationale was why bother to grow it if you can't eat it? Now I find myself spending more time in the flower section of the seed catalogs.
To be honest, probably 95% of what I am growing is edible, however it is still tempting to bend the seasons and grow flowers year round. They add a small amount of cheer during these dismal times when all the news is bad, and getting worse.

In selecting flower seeds I look for a variety that is unusual in shape or color, with a maximum height of 12 inches. The flower above is calendula officinalis calypso, which I am growing in the greenhouse in an old Folger's coffee container converted to a hydroponic growing container.

I am finding some flower seeds much more difficult to start than vegetable seeds. For instance; calceolaria seeds are so small they are about half the size of a grain of sand. After several tries in rockwool cubes I gave up and sprinkled my few remaining seeds onto a pot containing the coco noir and perlite mixture I use in the AutoPots. To my surprise they germinated in about a week. Unfortunately, I accidentally knocked the pot over and only managed to rescue one seedling. And, I find that the only way I can germinate aster seeds is to place them in a moist paper towel for 24 hours until a tap root begins to form. At that point, I use a chop stick to poke a small hole in a rockwool cube, and place the seedling into the hole using tweezers.

I am still growing in the greenhouse, and I will continue to do so until the weather turns really cold. In the ebb and flow systems I have about forty net pots with Swiss chard, and variety of leaf lettuce and herbs and I am growing asters, calceolaria and candy tufts. Flowers add little more challenge, and there is the anticipation of seeing the first blossom. As an added bonus, the lady of the house loves flowers, so they are proving well worth the effort.