the Prostanthera rotundifolia should be grown in a bright place, with direct sunlight. To prevent damage caused by the cold temperatures, during the months with definately harsh minimum temperatures, we can protect the shrubs by covering the soil around the stem with straw or dry leaves.The Prostanthera rotundifolia can't stand temperatures below zero; they should be grown in cold green houses or at least in a place where they are sheltered by the wind; when every risk of late freezings has gone by we can place them outside or remove the protections.
Generalities Prostanthera rotundifolia
These plants have a sapling deportment, with a short stem with a small roundish crown. The Prostanthera rotundifolia Is medium in size; in summer it assumes a purple colouring. These are evergreen plants, which means they keep their leaves year round. The Prostanthera rotundifolia has a shrub- like development.
Fertilization Prostanthera rotundifolia
Shrubs develop new shoots and prepare their flowers during the spring period, therefore we must remember, by the end of the winter, to give it a good dose of humus or mature manure, or granular slow release fertilizer, to be added to the soil at the foot of the plant. During the spring we can choose a fertilizer rich in nitrogen and potassium, to mix with the irrigating water, every 20-25 days.
Watering Prostanthera rotundifolia
Water rarely, about once every 2-3 weeks with 1-2 buckets of water , keeping the soil dry for a few days before watering again; when wetting we suggest avoiding surpluses, however to wet the soil deep down. If we want to grow these plants in a vase, we should water them a bit more often, compared to plants cultivated in the ground; Every 2-3 years we should renew the substratum in the vase, or enrich with organic amender.
Treatments Prostanthera rotundifolia
Generally during this time of year we suggest a pre-emptive treatment with wide range insecticide and with a systemic fungicide, to prevent the attack from part of the aphids and the development of fungus diseases, often favoured by a mild and damp climate.
Soil Prostanthera rotundifolia
For these shrubs it’s necessary to choose a rich and deep substratum , which presents an excellent drainage.
Notes Prostanthera rotundifolia
The Prostanthera rotundifolia also has a pleasing fragrance. The indications given in this article are related to a medium size plant.