Basil, Ocimum basilicum, is an aromatic culinary and medicinal herb that’s perennial in USDA Hardiness Zones 10 to 11 and a summer annual in other regions.
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Our guide to growing basil has all you need to know to grow this herb at home.
This article discusses two ways to prune the plant to keep it compact, lush and leafy, and long-lived.
Here’s what we’ll cover:
Let’s begin with a brief review of cultivation.
Basil Growing Basics
A basil seed produces an upright stem with pairs of opposite leaves, beginning with cotyledons or “seed” leaves and followed by true leaves.
When the plant is six inches tall, it’s past the seedling stage and can withstand the shock of being trimmed, provided you don’t remove more than a third of any given stem, or a third of the overall volume, at one time.
When we don’t cut it back, the stems can get “leggy,” putting energy into growing taller instead of making lots of foliage.
The space between the leaves elongates, resulting in a sparse, fragile appearance and susceptibility to breakage.
The cultural requirements for cultivation include full sun, organically-rich, well-drained soil, and nitrogen-rich fertilizer.
Regular watering is essential to maintain moist but not soggy soil. Moisture is crucial during peak summer heat that can stress plants and cause them to flower prematurely or “bolt.”
Bolting is a sudden shift from vegetative to reproductive growth, during which leaf production stops and spikes of purple or white flowers grow, signaling the end of the life cycle.
Plants with leggy stems, and those about to set seed, benefit from pruning to promote a stable form,
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