The stolons They are fascinating structures in plants, whose function and relevance span both the natural and agricultural spheres. Discovering what they are and what they are used for is essential to understanding the methods of vegetative reproduction and the adaptations that have allowed numerous species to develop and thrive in different environments.
What are stolons?
En botany, stolons are defined as trailing stems or shoots that usually emerge from the base of a plant's main stem. They develop horizontally, extending above the ground or just below the surface, and present knots where they can form roots and generate new plants. Thanks to this mechanism, the plant can colonize nearby areas efficiently and without relying on sexual reproduction.
Frequently called Corridors o creeping rhizomes, stolons are a natural expansion strategy that has been adopted by various plant species, allowing their propagation without requiring seeds or the intervention of flowers or pollination.
What are stolons for?
The main function of stolons is asexual vegetative reproductionThis reproductive modality allows plants to develop new individuals from a mother plant, without the participation of gametes or the formation of seeds.
Among the key functions The most notable stolons are:
- Efficient multiplication: The stolons favor the rapid expansion of the species, producing clones genetically identical to the original plant.
- Colonization of spaces: By covering surfaces through horizontal growth, the plant is able to occupy empty or resource-poor areas, ensuring its survival and competitive advantage over other species.
- Survival in adverse conditions: Forming new shoots at a distance from the parent plant increases the likelihood that some will survive in the event of sudden changes in the environment.
- Ease of agricultural management: From an agricultural and gardening perspective, runners allow for simple and economical propagation of species of interest, such as grass, strawberries, or mint. Alternative options to grass They also include species that use stolons for expansion.
Characteristics of stolons
When analyzing stolons, distinctive properties are identified that differentiate them from other vegetative organs. Some of the most relevant characteristics are:
- Horizontal growth: They develop parallel to the ground, either superficially or just below the ground.
- Rooting capacity at nodes: Roots and shoots can emerge at each node and eventually become independent from the parent plant.
- Clear segmentation into nodes and internodes: Nodes are key growth points, while internodes correspond to the spaces between them.
- Production of genetically identical clones: Development is purely asexual and therefore the new individuals are exact copies of the original plant.
Examples of plants that use stolons
Stolons are found in numerous ecologically and economically important plant species. Some notable examples are:
- Strawberries (Fragaria spp.): Strawberries are perhaps the best-known example; they produce aerial stolons that extend and root, forming new plants almost continuously throughout their growth cycle.
- Mint (Mentha spp.): This popular aromatic plant uses stolons (and also rhizomes) to spread throughout the garden, often becoming a very invasive species. Mint and its varieties They take advantage of stolons for their rapid propagation.
- Grass or grass (Cynodon dactylon): Grass, widely used in gardening and landscaping, colonizes surfaces using stolons that form a dense, uniform carpet of vegetation. Also in recommendations for lawns The use of stolons for its propagation stands out.
- St. Augustine herb (Stenotaphrum secundatum): Another type of grass that reproduces mainly by stolons, appreciated for its resistance and easy propagation.
- Some species of ferns: Certain varieties of ferns use stolons to expand horizontally on moist substrates.
The presence of stolons gives plants an enormous capacity for adaptation and survival.
Differences between stolon and rhizome
Although they are often confused, stolons and rhizomes represent distinct vegetative structures. The key differences are:
- Stolon: It is a creeping stem, generally thin and flexible, that develops on the surface of the soil or just below it, and that roots at the nodes to give rise to new plants. Adventitious roots They can form at the nodes of stolons.
- Rhizome: It's a thicker underground stem that grows horizontally underground and stores nutrients. New stems and roots also sprout from rhizomes, but these tend to be more robust and store-like structures.
While stolons allow rapid colonization of surface areas, rhizomes act as reserve organs that ensure the plant's survival in adverse conditions.
The role of stolons in nature and agriculture
The function of stolons goes beyond simple propagation. In natural ecosystems, these horizontal shoots promote the establishment of compact plant communities and their regeneration after disturbances such as fires, trampling, or drought.
In agriculture and gardening, runners have been used for the efficient multiplication of crops of economic interest. Large-scale strawberry cultivation and the sowing of grass for gardens, sports fields, and green areas benefit from the use of runners to ensure rapid and uniform coverage. For more details, see our growing and propagation guides.
In addition, some weeds and invasive plants use stolons as a tool to spread and compete, so controlling them in these cases may require specific strategies to prevent unwanted spread.
