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Generalitа
This genus includes 30-40 species of rhizomatous perennial herbaceous plants originating in North and Central America. They constitute dense groups of semi-woody stems, very branched, about 50-70 cm tall; they bear large oval, pointed leaves, dark green, rough and thick; at the apex of each stem is a short panicle of small flowers, which bloom from summer until autumn, generally blue in color, although there are species with pink, white and orange flowers. The leaves are edible and very aromatic, they are often used in salads or to flavor hot drinks.
Exposure
The agastache they love sunny positions, and they can easily withstand hot summer days; they develop without problems even in areas of partial shade. They do not fear the cold, since the plants in winter go into vegetative rest and the aerial part dries up. These plants tend to grow and grow very high, so it is advisable to plant them in places where they can have enough space to develop. These plant species are particularly suitable for creating large patches of mixed border in the countryside. If you cultivate the agastache with this purpose, it is good to plant them at a distance of 40-50 cm from each other for better results.
Watering
It is advisable to water the agastache from March until October on a regular basis, at least every 2-3 days, supplying large amounts of water and always allowing the soil to dry well between one watering and another. This is to avoid mainly water stagnation. During the vegetative period, add fertilizer for flowering plants to the irrigating water at least every 10-15 days.
Ground
These plants love rich, loose and well-drained soils; before planting them, it is advisable to work the soil, adding sand and balanced soil and a good dose of slow release fertilizer or organic fertilizer. The best time for fertilizing is autumn and spring.
Multiplication
The agastache reproduce without problems due to the division of the rhizomatous roots, each portion is immediately placed at home. At the end of winter it is also possible to sow the agastache in a mixture of sand and peat in equal parts, the new plants should be planted in a sunny place in spring. During the winter it is possible to remove the dried leaves and stems.
Agastache: Pests and diseases
These plants are not particularly affected by pests or diseases. The only problem they could manifest is given by the black aphids that attack the ear of flowers, ruining it completely. This "plant louse" attacks in most cases both the aerial part of the plant, that is the one outside the soil and the part covered by the earth, ie the roots. When the plant is attacked by the black aphid, the leaves shrivel and dry. In the main garden centers or nurseries it is possible to buy specific pesticide products that can effectively defeat this pest.
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