Plant in full sun to light shade and water regularly to occasionally in late spring and early summer. Tolerates fairly dry conditions in coastal gardens but vigor and flowering is best when plants are irrigated at least occasionally. This variety was bred for cold hardiness and should tolerate temperatures as low as 5°F, particularly if mulched. When trimming or cutting Alstroemeria for flowers pull the stems out so they break off below ground at the crown to stimulate the formation of new shoots but do so carefully so not to pull out pieces of the rhizome itself. This plant has been incredibly long blooming in coastal California gardens and with its rich bronze leaves (when grown in at least half day sun) and bright cheery flowers it will decorate any garden. Luckily alstroemeria are also pretty much ignored by deer. It works great as a border plant, specimen planting or in the cutting garden and spectacular when planted in a mass planting.

We find the name Indian Summer quite fitting for this plant as we first saw this beautiful plant when touring Wisley and Kew gardens in England in the fall (what is sometimes called "Indian Summer") of 2017 and thought it so sensational that we had to track it down. In our own garden this plant can be found blooming through New Year's Day and with lingering flowers and continuing through late summer when it peaks but still going strong later and starting earlier in the spring (never stopping) than any other Peruvian Lily we have ever grown.

Alstroemeria Indian Summer was first displayed at the 2013 European Spring Pack Trials by HilverdaKooij Plant Technology of the Netherlands. It was noted to be part of a series of Alstroemeria that were bred for European gardens with claims that they are cold hardy to -15°C (5°F). The first plant released using the marketing name Indian Summer was 'Tesronto' and it had Plant Breeder's Rights asserted in Europe, but was never patented in the US. What was called a selected mutation of this plant was named 'Tesronto Imp' and it was noted as more vigorous and growing larger with larger flowers. Under this 'Tesronto Imp' name it received US Plant Patent PP 4,540 on June 10, 2014. We have both plants from the earlier release and what was later released as the improved version in our garden and really see no difference between the two - both reach the same height with the same flowers present year-round.

The genus Alstroemeria was named by Carl Linnaeus, often called the Father of Taxonomy, for his friend and student Klaus von Alstroemer (Clas Alströmer), a Swedish baron. Alstroemeria plants come from two areas within South America with summer growing species restricted to eastern Brazil and winter-growing plants from central Chile with common names such as Peruvian Lily, Parrot Lily, or Lily of the Incas. Images of this plant on this page taken at the Royal Botanic Gardens at Kew on October 3, 2017. 

This information about Alstroemeria Indian Summer ['Tesronto Imp'] PP24,540 displayed is based on research conducted in our horticultural library and from reliable online resources. We also will relate observations made about it as it grows in our nursery gardens and other gardens we have visited, as well how the crops have performed in containers in our nursery field. We will also incorporate comments that we receive from others and we welcome hearing from anyone with additional information, particularly if they can share any cultural information that would aid others in growing it.