Stock Plant Management of Lavandula angustifolia ‘Wee One' Using Plant Growth Regulators

Abstract

Lavandula angustifolia ‘Wee One' is a drought-tolerant perennial being used in landscapes throughout the western United States. Increased demand has resulted in problems with stock plant management and propagation due to the relatively small and slow vegetative growth. The objective was to determine if gibberellic acid, benzyladenine, ethephon, or auxin [indole-3-butyric acid (IBA)] plant growth regulators (PGR) applied as a foliar spray on Wee One lavender plants could be used to increase the number of cuttings for production. Fifteen replications of Wee One Lavender were evaluated for four months for plant height, width, number of cuttings, and fresh and dry weight of the cuttings. This study was replicated twice, the first experiment was performed from March 2020 to July 2020 and the second experiment from August 2020 to December 2020. A secondary propagation study was conducted simultaneously to check if PGR residuals effected rooting. The use of different PGRs caused an increase of cuttings from stock plants throughout both experiments. Foliar applications of gibberellin (ProGibb T&O) at 100 mg·L−1 (ppm) increased stem length and branching in one experiment, resulting in a higher number of cuttings produced compared to nontreated control stock plants, although that effect was not seen in the other conducted study. In one study, ProGibb T&O application did not negatively impact the rooting of individual cuttings, while it did so in the other study. Species used in this study: Wee One lavender [Lavandula angustifolia Mill]. Chemicals used in this study: gibberellic acid (GA3), ethephon, indole-3-butyric acid(IBA), N-(phenylmethyl)-IH-purine 6-amine (BA).

The Effect of Immersing the Bud Cuttings with a Combination of NAA and BA Growth Regulators and the Addition of Optimus Plus Nanofertilizer in Improving some Vegetative Qualities of Ber Seedlings Apple Variety

“…which helps in the transfer of water and nutrients and the formation of a good fusion site . Which was reflected in the increase in the percentage of success of the grafts , the length of the main stem, the diameter of the main stem, the number of branches in the plant, and thus an increase in the number of leaves and the leafy area of the plant [11]. The effect of immersing the local orange taste in benzyl adenine at a concentration of 250 mg.L -1 , It significantly affected (the success rate of grafts , plant height, number of leaves and number of branches) compared to the comparison treatment .…”

Influence of Planting Date and Growth Stimulants on Growth and Chemical Compositions of Euphorbia milii Plant

“…They also indicated that GA3 at 100 ppm helped produce the heaviest dry stems, and that GA3 at 300 ppm achieved the longest leaves. Elsadek et al, (2020) on Codiaeum Variegatum, Lima et al (2020) on Aloe vera, Hoque et al, (2021) on Gladiolus hybridus L, Khalafalla et al, (2022) on Gladiolus hybridus L. and Schriner and Klett (2022) on Lavandula angustifolia since they found that the foliar applications of gibberellins at a rate of 100 (ppm) caused an increase in vegetative growth parameters.…”