(Image from: https://hudsonvalleyseed.com/products/ukrainian-slicing-cucumber?_pos=1&_psq=ukrain&_ss=e&_v=1.0)
Growing Instructions for Ukrainian Slicing Cucumber:
Start indoors 3 weeks before last frost and transplant to indicated spacing after threat of frost has passed; or direct sow seeds spaced 4 inches apart as soon after last frost, then thin to indicated spacing once seedlings put on their first true leaves. Plant in moderately fertile soil and water regularly. Can be trellised if space is tight or allowed to grow on the ground. Harvest when cukes are green and white and skin begins to turn smooth, but before they are shiny and yellow. Fruits are tender, sweet, and tasty fresh-slicing cukes at up to 8". Sow again in early summer for fall harvest.
(from Hudson Valley Seed Company website)