Trillium grandiflorum

Trillium grandiflorum

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the genus trillium has about forty species of rhizomatous perennial herbaceous plants, originating in Asia and North America. From the fleshy rhizomes develop cylindrical, erect, semi-woody stems, 20-50 cm high, which over the years tend to form large bushes; at the apex of the stems the broad leaves grow, in groups of three, they are pointed, wrinkled, often spotted with green in fairly dark shades. During the spring months, large white, yellow, pink or purple-red flowers blossom between the leaves, formed by three sepals and three petals of the same color. The flowers face upwards, but some species, such as T. catesbai, produce flowers facing downwards. These rhizomatous plants are not very common in European gardens, while they are widespread in North America; their cultivation is very simple, and it is recommended to cultivate the trillium near the calle. THE trillium grandiflorum are generally used to make flowerbeds and borders that color the gardens.


Trillium grandiflorum are very suitable for shady or semi-shady locations, even at the foot of tall shrubs or trees; in the places of origin they grow in the undergrowth, therefore they fear direct sunlight, especially during the hottest hours of the day. They do not fear the cold, and can withstand very harsh temperatures, since the aerial part dries up during the winter and the plant has a period of vegetative rest, but the leaves will start to appear again as spring arrives. They are plants much more sensitive to higher temperatures, which cause suffering and stunted growth.


From March to October, avoid prolonged periods of drought, watering the soil only when it is dry, avoiding excesses. Avoid watering during the cold months. The specimens of T. grandiflorum need a certain degree of humidity to be maintained in the soil in which they are planted, preventing it from drying excessively during the hot season. In the winter period, on the other hand, the specimens of this type go into vegetative rest and, for this reason, they do not need watering.


The rhizomes of trillium grandiflorum develop best in slightly acid, light, soft and quite drained soils. However, they are rather rustic plants, which manage to adapt to different soils, even if a lack of drainage can cause water stagnation and consequent radical, harmful and potentially fatal rot for these specimens.


The reproduction of plants of this genus takes place by division of the rhizomes, in autumn. It is also possible to proceed with the collection of the seeds produced, to then be buried in a soft and drained substrate. In this case, however, it takes at least 5 or 6 years before the plant flowers and, proceeding with this technique, it is not said that the new plants have the same characteristics as the mother plant, given the genetic variability.

Trillium grandiflorum: Pests and diseases

Snails are fond of the foliage and rhizomes of trillium grandiflorum; excess watering can cause the development of various types of rot. If action is not taken promptly, root rot can lead to the death of the plant. As for the snails, it is possible to find on the market some specific products to be distributed on the ground surrounding the plants to avoid a possible attack that could irreparably ruin the plant.