enable them grow vs enable them to grow

Some examples from the web:

• ... allows the sugars that result from photosynthesis in the leaves to be transported back down to the roots and out to blossoms and crops to enable them grow.
• We design specific solutions that meet specific needs of different sets of entrepreneurs and businesses with an aim to enable them grow and scale.
• Sep 3, 2014 ... Obara called on parents and teachers to help in mentoring and encouraging girls to enable them grow high profiled citizens. [Picture: Omondi ...
• Nov 29, 2006 ... ... the instructors, management and students at the centre communicate more reliably with the outside world and this will enable them grow.

Some examples from the web:

• It is designed to assist students with their transition to college and to enable them to grow intellectually and personally. Through weekly goal oriented sessions, ...
• Buttresses and above-ground roots enable them to grow in unstable mud flats. Their foliage removes excess salt from the sap, and they conserve water to cope  ...
• The program accomplished this by providing funds to institutions to enable them to “grow their own” librarians from among select employees within their staffs.
• The Rhetorical, in which teachers guide their students to contemplate great texts and works of art, believing that such contemplation will enable them to grow in ...