Grow Diary : Rocket
- Sow in spring from the last frost through to late summer in a sunny location.
- Sow thinly in fine soil 1/2in deep in rows 12in apart. Thin seddlings to 9-12 inches apart.
- Keep moist and weed free.
- Harvest young leaves a few at a time and the crop should keep producing throughout the season.
- "Soil Association" registered and certified Organic - AP22387. Full growing instructions found below in the product description.
Organic Rocket seeds were started in a heated incubator using Root Riot Organic Starter Cubes with sprouts appearing after 3 days. The seedlings were transferred to 10L Kratky hydroponic buckets approximately 4 days later (1 week after seed start). The buckets were filled with approximately 9L of Aqua Vega nutrient media made up to 730ppm and a pH of 6.2.
The plants grew very well. Keep in mind that we couldn't resist helping ourselves to a lot of those tasty rocket leaves over the 3 months or so that they were growing and the growth of the plants shown in the pictures are really an under-representation of how well they really grew!
Unfortunately, the plants could not go on indefinitely, at least not within the current Kratky hydroponics system, as natural changes to the media, the age of the plants and possibly also due to the hotter than normal temperatures of the conservatory eventually caused the plants to start flowering at approximately 3 months from seed start. Although the flowers were quite pretty, they end up diverting a lot of energy that the plant could have used to make more edible leaves. As a consequence the test grow was terminated around this time. Measurement of the properties of the remaining media (approximately 0.5L was left) revealed that it had a pH of 8.3 and a ppm of 700, suggesting that a higher than normal pH could have also been one of the contributing factors for the plants moving into the flowering stage.
Overall, growing Rocket plants in a Kratky hydroponics system was quite successful and with a few tweaks can be very efficient at producing a good yield of edible leaves.