Growing the Van Zyverden 5 in. Kumquat Citrus Tree in the garden is rewarding, and it naturally produces the biggest and most vigorous specimens. Citrus makes for unique and beautiful landscape trees, offering evergreen foliage, fragrant blooms, and delicious fruit. However, before planting, you must determine whether the location you have in mind will be suitable. This citrus plant is happiest in warm zone climates. This fruit plant is grafted on semi dwarf rootstocks, making it ideal for container growing. No yard is needed.