Fertilising a Pennisetum alopecuroides
To support the robust growth and the characteristic upright to bushy habit of Pennisetum alopecuroides, a balanced fertilization regimen is key. Ideally, apply a complete, slow-release granular fertilizer in early spring to coincide with the onset of active growth. This species appreciates the steady provision of nutrients, which bolsters its lush green foliage and the development of its unique brown flower spikes in summer.
As the plant is resilient and drought-tolerant once established, over-fertilization should be avoided to prevent excessive growth that could compromise its form and hardiness. An annual application is typically sufficient. If additional feeding is deemed necessary, a light mid-summer fertilization can be given, particularly if the plant is grown in a container or in very sandy soil where nutrients may leach quickly.