Welcome to our ongoing blog series, originally shared on Instagram, where we dive deep into the world of plant growth and lighting. Today, we explore a crucial aspect of plant cultivation: the proper Vegetative (Veg) Photosynthetic Photon Flux Density (PPFD). As it turns out, the ideal Veg PPFD depends on your specific goals. According to a recent study, a range of 600 – 900 PPFD or even higher (1000+ PPFD) is recommended if you aim to cultivate compact plants, especially for vertical growers.
For seasoned growers, here's an interesting insight: If your goal is to maintain compact plant growth, particularly before the flowering stretch phase, consider using a blue-enhanced spectrum light, such as the 𝐌𝐚𝐦𝐦𝐨𝐭𝐡 𝐕𝐞𝐠 𝐒𝐞𝐫𝐢𝐞𝐬, along with 𝐇𝐞𝐚𝐯𝐲 𝐋𝐢𝐠𝐡𝐭. This combination can optimize plant morphology, ensuring compactness and promoting the development of numerous bud sites.
At Mammoth, we collaborate with some of the world's largest vertical growers, and this type of research and analysis is part of our commitment to our loyal followers. 😃 You can enjoy this valuable information at no cost.
Light Intensity, Spectrum, and Plant Morphology: Light intensity stands as one of the most critical environmental factors influencing plant growth. Multiple studies have shown that cannabis yield correlates linearly with light intensity (Zhen 2021; Eaves 2019; Bugbee). Generally, light intensity influences yield, while spectrum affects plant morphology and cannabinoid production. However, we can guide plant morphology by manipulating light intensity.
If you are a vertical grower or face space limitations, maximizing your space is paramount. Therefore, pushing your plants with intense light during the vegetative stage, along with a blue-enhanced spectrum, is highly recommended. For the full study, be sure to visit our website.
In contrast, low-intensity light often leads to photoinhibition (Long et al., 1994) and elongated plant growth. Low light levels are known to cause plant stretching and increased height.
Light Spectrum Tips: When it comes to light spectrum, a balanced approach is preferable. Utilize a light source that combines both cool (5000k) and warm light (3000k). A higher proportion of blue light inhibits cell elongation, resulting in shorter stems and thicker leaves. Conversely, reducing blue light leads to larger leaf surface areas and longer stems. It's essential to strike a balance because too little blue light can hinder plant development.
In the case of cannabis, plants grown under a predominantly blue LED spectrum were shorter and more compact compared to those grown under red HPS treatment (Magagnini 2019).
Stay tuned for more illuminating insights as we continue to explore the intricate relationship between light and plant growth. 🌱💡