Incorporated in Texas in 1968 and reorganized in Bermuda in 1994, Helen of Troy is a leading global consumer products company offering creative solutions for our customers through a diversified portfolio of well-recognized and widely-trusted brands in three business segments: Housewares, Health and Home, and Beauty. We have built leading market positions through new product innovation, product quality, and competitive pricing.
In fiscal 2015, we launched a five-year transformational strategy designed to improve the performance of our business segments and strengthen our shared service capabilities. This strategy has driven our decisions on where we will operate and how we will achieve our goals in markets around the world. The overall design of our business and organizational plan is intended to create sustainable and profitable growth and improve organizational capability.
Fiscal 2019 marked the completion of Phase I of our multi-year transformation strategy, which delivered performance across a wide range of measures. We improved organic sales growth by focusing on our Leadership Brands, made strategic acquisitions, became a more efficient operating company with strong global shared services, upgraded our organization and culture, improved inventory turns and return on invested capital, and returned capital to shareholders. During Phase I we achieved a compound annual growth rate (CAGR) in net sales and adjusted diluted EPS of 3.7% and 12.4% respectively. Fiscal 2020 began Phase II, and the next five years, of our transformation during which we continued our momentum, achieving net sales and adjusted diluted EPS growth of 9.2% and 15.4% respectively.
The beginning of our fiscal 2021 coincided with the global spread of COVID-19. We moved quickly and decisively to help ensure the safety and health of our associates around the world, and the communities where we operate. We were equally decisive on actions to help improve liquidity and reduce the impact on cash flow. Our diversified portfolio of brands has proven resilient with our healthcare products under the Braun, Vicks, PUR and Honeywell brands supporting consumer health at a time of extreme need, including devasting wildfires in the western United States. Our OXO products are providing convenience, comfort and solutions as families spend unprecedented amounts of time at home, and Organic Beauty sales growth reflects the success of our One-Step volumizer franchise. The underlying strength of our Hydro Flask brand was reflected in sales growth during the second quarter of fiscal 2021 as stores began to reopen, albeit with lower than normal foot traffic. Including the contribution from the Drybar acquisition, consolidated first half fiscal 2021 net sales grew 20.4% and adjusted diluted EPS grew 46.5%, and we generated $186 million of cash flow from operations.
As always, we remain focused on supporting, and delivering for, our customers and consumers while progressing our Phase II long-term objectives such as improved organic sales growth, continued margin expansion, and strategic and effective capital deployment. We expect Phase II will include continued investment in our Leadership Brands, with a focus on growing them through consumer-centric innovation, expanding them more aggressively outside the United States, and adding new brands through acquisition. We anticipate building further shared service capability and operating efficiency, as well as attracting, retaining, unifying, including and training the best people.