Tarragon has a pleasing, anise-like flavor. Mexican tarragon can be used as a substitute for the more widely used French tarragon, but the Mexican variety is supposedly easier to grow. Let’s see how this plant does in the simple hydroponics system.
Jan 7, 2016 = Day 0. Plants started from seed (Botanical Interests). Seeds sowed in 1.5-inch rockwool cube in 2-inch net-pot. Moistened with dilute fertilizer solution: 1 mL (1/5 tsp) Dyna-Gro Liquid GROW 7-9-5, 1 mL pH Down per gallon of tap water. N-P-K (in ppm): 18-10-11. pH = 6.0.
Jan 11, 2016 = Day 4. Plant germinated, placed directly under a fluorescent light (2 ft. T8 bulb, 17W, 6500k) for 16 hours per day.
Jan 29, 2016 = Day 22. Installed plant into 0.5-gallon glass jar. Hydroponic solution composed of 0.5 gal tap water, 3 mL Dyna-Gro Liquid GROW 7-9-5. N-P-K (in ppm): 111-62-66. pH = 6.0. No pH adjustment required.
Feb 11, 2016 = Day 35. Transferred plant to indoor grow room, where it gets 9 hours LED light per day, plus 3 hours of sunlight.
Mar 1 = Day 54. Based on information obtained in this post and this post, it seems that the pH of the Liquid GROW-based hydroponic solution tends to drop below 4.0 by the end of the growing period, which is not ideal for nutrient uptake. Therefore, I have switched to a MasterBlend-based solution. N-P-K (in ppm): 103-41-168. pH = 6.0.
Mar 16 = Day 69. Trimmed all flowers off plant. Began harvesting leaves. Tips of lower leaves were starting to burn, so I moved the plant back to the less-intense fluorescent lights (2 ft. T8 bulb, 17W, 6500k) for 16 hours per day.
Apr 5 = Day 89. Harvested some of the leaves, pruned back plant significantly. Plant is not growing much these days. Added 2 cups fresh hydroponic fluid.
Apr 17 = Day 101. Harvested all remaining leaves. Total water usage = 7 cups (0.44 gal).