Grow Diary Granddaddy Purple

Granddaddy Purple – Week 3 of Vegetative Stage

Today marks day 19 post-emergence, and both Granddaddy Purple plants have completed their vegetative progression - 5 days in early veg, 2 days in mid veg, and 2 days in late veg prior to topping. Growth has been steady and balanced throughout, with strong stems and tight internodal spacing.

Light intensity was gradually increased from the mid-400 PPFD range to a consistent 575–600 PPFD, producing a DLI of 36–39. The light sits 13–15 inches above the canopy, maintaining compact structure and uniform development across both plants.

Each plant was topped above the fifth node and node 1 removed, leaving four well-positioned branch sets to form the main canopy. Before topping, GDP1 stood 12 inches and GDP2 13 inches; after topping, heights range 10–12 inches.

Feeding strength increased from approximately 500 PPM to 800 PPM this week as the plants transitioned into late vegetative growth. The solution was maintained at pH 6.0, ensuring optimal uptake in the inert PRO-Mix HP medium. The plants absorbed the higher concentration smoothly, with no signs of nutrient stress or tip burn. Leaves remain richly colored and firm, showing balanced hydration and excellent vigor.

Following topping, PPFD was temporarily reduced to 575-600 to moderate transpiration and stress. Over the next five days, the plants will recover, redirect energy to new growth tips, and then begin low-stress training before the 12/12 light flip.

Granddaddy Purple continues to display textbook structure and stability heading into transition.