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Caring for roses in the summer: pruning, propagation, fertilization and phytosanitary interventions to combat the appearance of diseases.
Caring for roses, summer pruning
Therepruningmust be done onHybrid Tea roses and othersreblooming roses,these roses need to be pruned to stimulate new flowering:
- - eliminate the old withered roses by cutting about a third of the branch. Cut on top of a real leaf showing, in the armpit, a prominent gem facing outwards.
As regards theroses grandiflora, you have to limit yourself to thin out the lateral buds so as to stimulate the formation of larger flowers.
There are no interventions ofpruningon Floribunda roses that ripen the rosehips (those red berries) and produce new flower shoots. Therefore, no action is taken on the shrubs that will produce rose hips such as Rosa rugosa, Rosa complicata, Rosa scabrosa and all botanical roses.
With Rosa Floribunda, withered flowers should not be cut because in autumn they will produce berries (rosehips).
Caring for roses in the summer: fertilizing
Generally, roses are fertilized in spring, between May and June. Those who have not carried out any fertilization can postpone this operation in the second half of August.
Choose a specific fertilizer for roses following the dosages and instructions on the label. Use a liquid fertilizer or, if you choose a granular fertilizer, remember to weed the soil lightly before spreading the fertilizer at the base of the plant, then irrigate abundantly. Avoid that the granular fertilizer comes into direct contact with the base of the plant.
Multiplication of roses
Summer is theperiodideal for thepropagation of roses. Among the various propagation techniques it is possible to choose the cutting.
When cutting roses?
From mid-July to mid-August.
With a clean cut, cut off the terminal part (approximately 15 - 20 cm) of a young (one year old) semi-woody branch. Remove the apical bud and the lower leaves.
Dip the base of therose cuttingin the jar containing the rooting hormone so as to develop root formation and speed up the procedure.
Useful links: Clonex rooting hormone for woody cuttings and rose cuttings
Place the rose cutting in a vase, burying it for about 6-8 cm, use a substrate given by sand and universal soil, mixed in equal parts. Always keep the soil moist and cover the cutting with a specially cut clear plastic bottle. to the base. The plastic bottle must be placed with the neck upwards (without the cap), so you will have to remove the bottom.
How to care for roses in the summer
There are other treatments to be dedicated to the rose bushes, which are essential especially in the summer, when the heat weighs on roots and vegetation.
- - Renew the mulch of the roses.
- - Roses should be irrigated weekly, irrigated in the evening without ever wetting the foliage.
- - Eliminate weeds, pay attention especially towards August or if the summer weather trend sees frequent summer rains.
- - Eliminate dry branches and leaves affected by fungal diseases. Fungal diseases spread through spores, so diseased leaves and branches should be removed from the garden otherwise they could cause other attacks.
Diseases of roses
The bad white of rosesit is a typically summer disease. If you notice a floury white mold on the leaves, buds and flower buds, perform 2 - 3 operations to be repeated on a weekly basis, with wettable sulfur or colloidal sulfur. For wettable sulfur use 40 grams for every 10 liters of water while for colloidal sulfur, 20 grams will be enough for the same amount of water. The treatment must be performed in the evening.
Another common disease of roses is scab: if you notice black spots on the leaves of roses, it is important to intervene with copper oxychloride or copper hydroxide. For more information:black spots on the leaves of roses.