Leafy and Fruiting Vegetables
In both leafy vegetables and fruiting vegetables, a plant growth regulator such as ProGibb® (GA3) can be a great tool to get plants off to a good start. In fruiting vegetables, it can increase fruit set, promote fruit growth and increase final fruit size.
To promote early growth, a ProGibb application is made in the early stages of plant development. This application is especially advantageous when lower than normal temperatures are expected, and growth of untreated plants would normally be slowed under these conditions.
On fruiting vegetables, a second application is made at the small fruit stage and another is made 10 to 14 days later to increase set and promote fruit growth.
On leafy vegetables such as spinach, an application is made 10 to 18 days before each anticipated harvest. For best results, growers should spray when daytime temperatures are between 5° to 15°C (40° to 60°F), and during the morning hours when dew is present on the foliage. To increase the size of fruiting vegetables, another application of ProGibb is made at the beginning of harvest. Growers should note that this application should not be made within seven days of any previous treatment applied to increase the fruit set.
On leafy vegetables such as lettuce and spinach, a ProGibb application causes enlargement of the leaf blade and extension of the petiole, lifting the plants up from the soil line. This not only facilitates harvest, it allows for a cleaner (less dirty) product. It also means increased yield, because not only is there greater foliage mass, but a higher percentage of the crop can be cut, and with minimum debris.
The expected increase in revenue due to this simple pre-harvest treatment can be 10 to 30 times its cost, depending on the crop, location and market. This increase does not even account for the value of shortening the crop cycle and obtaining a cleaner crop.
When applying ProGibb on spinach to promote growth of a second cutting, it is important to wait until some re-growth is present. Also, do not apply if temperatures may be expected to exceed 24°C (75°F) within several days of application, as it may cause bolting.