Hybrid Tea and Grandiflora Roses are the types that one receives on Valentine's Day. This elegant rose is long stemmed with typically large flowers. A familiar Hybrid Tea Rose is "Peace" with its huge multicolored flowers shaded from pale yellow to pale pink. A Grandiflora is a longer stemmed hybrid tea that has clusters of flowers. One Grandiflora variety we all know and love is the Queen Elizabeth.
Hybrid Tea Roses typically have one flower on each stem, while Grandifloras occur in clusters. If you remove the outer flower buds from Grandifloras you can have a spectacular result in larger central flowers.
These roses need a little tender loving care, but they are well worth it! Deadhead after the flowers are spent, cutting down to the next five leaflets where the stem is pencil thick. During the hot summer, cut back all leggy and unproductive growth to the main cane, remove all dead wood on any part of the plant that looks unwell. This will improve air circulation and suppress fungal disease, but will also encourage the plant to grow and bloom again.
In the late fall, the roses will need to be pruned for the winter. Cut back, leaving four or five major canes with an average height of three feet. Removing the older canes will encourage basal breaks in the spring, and this is a fundamental to the health of the bush.
Hybrid Tea and Grandiflora Roses respond well to mulching, which will help keep weeds down and retain moisture. Water is vital to your roses; each plant needs one to two inches of water a week from spring to late fall. (Don't stop watering too early - plants need watering until temperatures are constantly cold). Deep watering is very beneficial as it keeps the root strong and deep within the ground.
Hybrid Teas and Grandiflora Roses are heavy feeders. Start feeding established plants when new growth is about six inches long, new plants after they have been planted three to four weeks. Established plants need to be fed in spring with a complete rose food. You may use a time-release synthetic fertilizer or a systemic fertilizer/insecticide blend. After the first bloom, fertilize with an organic liquid fertilizer, such as fish emulsion. Continue to apply the organic fertilizer weekly, and give the rose bush another application of complete rose food again in late June or early July. Do not fertilize a rose after August 1st, as this encourages tender new growth that is susceptible to damage from an early frost. Always follow label and safety instructions when using chemical fertilizers and make sure to work it into the soil. When applying dry fertilizer always water the ground well before and after to avoid burning the roots, and ensure that nutrients will quickly to be carried to plant.