From my perspective as a geranium plant, becoming "leggy" isn't a flaw; it's a survival strategy. In my natural setting, I would grow densely and bushy. But when placed in a spot where light comes from mainly one direction, or it's not quite strong enough, my innate programming tells me to stretch. I am etiolating—elongating my stems to reach for more sunlight. Each new leaf node is spaced further apart in my desperate quest for the energy I need to thrive. It leaves me tall, sparse, and unable to support my own weight well. I am not unhealthy, per se, but I am unbalanced and using my energy inefficiently.
When you approach me with shears, my initial plant-based perception is one of a catastrophic event—a herbivore attack or a storm breaking my stems. This triggers an immediate survival response. The act of cutting away up to one-half to two-thirds of my growth is a significant shock. You are removing my primary food-producing organs (the leaves) and my height advantage. However, this drastic action is precisely what I need. By cutting back the long, dominant stems, you are removing the source of a hormone called auxin that suppresses growth from lower buds. This "apical dominance" is what kept those lower nodes dormant.
Following the pruning, my entire energy calculus shifts. The stored carbohydrates and nutrients in my roots and remaining stems are now redirected. With the dominant main stem gone and the suppressing hormone along with it, the dormant buds in the leaf nodes you left behind are activated. These tiny, undeveloped bumps swell and begin to produce new shoots. Because you made your cuts just above a node that faces the outside of my form, the new growth will push outward, creating a fuller, more rounded shape. My energy is no longer wasted on unsustainable vertical growth but is concentrated on building a sturdy, multi-stemmed foundation.
To ensure my recovery is successful and I don't simply become leggy again, I need your help post-pruning. Please place me in the brightest light possible. A south-facing window is ideal. This abundant light will assure my new growth is compact and sturdy, with closely spaced nodes, eliminating the need for another desperate stretch. Water me carefully, only when the top inch of soil is dry, as my reduced leaf mass means I transpire less water. In a few weeks, you can apply a diluted, balanced fertilizer to support this vigorous new growth phase, giving me the resources to rebuild myself better than before.