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A 'fibrous root system' (sometimes also called 'adventitious root system') is the opposite of a taproot system. It is usually formed by thin, moderately branching roots growing from the stem.
A fibrous root system is universal in monocotyledonous plants and ferns, and is also common in dicotyledonous plants.
Most trees begin life with a taproot, but after one to a few years change to a wide-spreading fibrous root system with mainly horizontal surface roots and only a few vertical, deep anchoring roots. A typical mature tree 30-50 m tall has a root system that extends horizontally in all directions as far as the tree is tall or more, but well over 95% of the roots are in the top 50 cm depth of soil.
A few plants with fibrous root systems:

★ Gabrielles

★ Pteridophyta

★ White clover (''Trifolium repens'')

★ Marigold

★ Weed

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External links and references

External links and references

★ Ohio State site
Weeds have fibrous root systems, and that is why they are so hard to pull from the ground. When you do, though, make sure there are no extra roots. If there are any extra in the soil, the weed(s) will grow back again.
The fibrous root is a clump of short, threadlike divisions. They collect water and minerals