Varieties designated se have a gene that increases tenderness and sweetness. The result is an excellent combination of sweet, creamy and tender kernels with a longer harvest period. These se hybrids have se and su parents (a term called heterozygous). Some varieties are designated se+ (or homozygous) which means they have two se parents for an increased degree of sweetness. Sugary enhanced varieties do not require isolation from normal (su) sweet corn varieties but should be isolated from sh2 hybrid types known simply as "supersweets".