Questions & Answers about L’aglio cresce nell’orto.
nell’orto is a contraction of the preposition in + the definite article l’ before orto (which also starts with a vowel). So
• in + l’orto → nell’orto
Using the article is standard when naming enclosed spaces (like gardens), so nell’orto (“in the vegetable garden”) is natural. Saying in orto without any article is uncommon in standard Italian.