Journal of a rose gardener 20/10/16
Planting roses in autumn
Roses which have been planted in a pot can be planted into the ground anytime. Compost may fall away from the root ball of recently potted roses when removed. This is common in autumn. It should not affect the rose, just plant as usual.
‘Bare root’ roses can only be planted whilst they are dormant i.e. between late autumn and mid spring, as long as the ground isn’t frozen.
The hole should be deep enough for the bud union to sit just below soil level, and wide enough for the roots to spread. The surrounding soil should be broken up and not compacted, so that roots can spread easily. Fill the hole with water and monitor how long the water takes to drain away. This will give you an idea of how often to water your newly planted roses, as whilst roses are greedy for water they do not like to sit in it. Over watering a rose in a slow draining soil could put the roots at risk of rot.
Mycorrhizal fungi increases nutrient and water uptake by forming a secondary root system. Sprinkle Rootgrow (£2.25 - £9.99) in accordance with the dosage table into the planting hole, and place the rose on top of the granules ensuring the roots are in direct contact, and fill the hole as normal with a multipurpose compost such as Gro-Sure All Purpose (50 ltr £5.99 or 2 for £10). Making sure to mix the compost with some of your soil.
You can leave the soil a little indented around the base, particularly when planting on a slope, so that rainfall is directed to the root ball. Firm the soil to ensure the rose will not rock in strong winds, dislodging its roots and preventing establishment.
Around the rose, approximately 2 – 3 inches from the stems to avoid burn, mulch with a well-rotted manure such as Farm Yard Manure (£4.99). Late winter or early spring is the best time to mulch as there will be little loss of nutrients, any soluble nutrients will be washed into the root zone.
Ensure that the rose is watered after planting, and then again in the spring once it starts to grow.