The 10 acre site will be used for production of alpines and perennials.
Tarleton-based Lovania grows on 16 sites across 42 acres and now owns five of them. Lovania says the acquistion will mean more quality and range will be available for garden centres.
Glendale Horticulture took over Mahood in 2014.
Lovania has been developing its 23 acre site at Nook Farm, acquired in 2014. Phase two of the glass is now planned. The nursery is investing in new handling equipment to make it more efficient and plans new glass next year.
The NFU launched its new Plants and Flowers pledge at Lovania Nurseries on 22 June, extending its existing Fruit and Veg pledge to ensure ornamental suppliers are covered by the principles of the Groceries Supply Code Of Practice (GSCOP) in the same way as fresh produce suppliers.
Lovania managing director Charmay Prout said it had been "amazing to share the journey of success" with Aldi over the last 20 years.
Aldi plants and flowers buying director Katie Morris said 63% of the category is now British grown. Aldi plans 1,000 UK stores by 2022. It has 775 UK stores currently. Lovania supplies more than 40 contracts a year to Aldi from spring bulbs to Christmas trees.