Russian Tortoises are strict herbivores that graze on various grasses, weeds, flowers, and other vegetation in their natural Central Asian habitats. Their wild diet consists primarily of fibrous, low-protein plant material including drought-resistant grasses, herbs, and succulents. Replicating this high-fiber, low-protein nutritional profile in captivity is essential for preventing obesity, pyramiding, kidney damage, and other diet-related health problems common in tortoises fed inappropriate foods.
The captive diet should consist predominantly of dark leafy greens and grasses, comprising 75-80% of total food intake. Excellent staple foods include dandelion greens (leaves and flowers), collard greens, mustard greens, turnip greens, endive, escarole, radicchio, and various lettuce types except iceberg. Grass hay including timothy, orchard grass, and bermuda grass should be available constantly, providing essential fiber and helping maintain proper beak length through natural grazing behaviors. Many keepers offer fresh-cut pesticide-free grass or grow edible lawn grasses, which tortoises eagerly consume.
Weeds and wildflowers are highly beneficial, including dandelion flowers, clover, plantain, chickweed, mallow, and hibiscus. These provide excellent nutrition and enrichment while closely mimicking natural forage. Ensure all wild plants are pesticide-free and correctly identified before offering. Some keepers plant portions of outdoor enclosures with tortoise-safe vegetation for natural grazing and environmental enrichment.
Vegetables can comprise 10-15% of the diet but should not be the primary food source. Appropriate options include squash, bell peppers (sparingly), cactus pads (opuntia), and green beans. Carrots and other high-sugar vegetables should be very limited. Fruits should be strictly minimized to no more than 5% of the diet or offered only as rare treats, as excess sugars disrupt gut flora and can contribute to health problems. Small amounts of berries, melon, or apple can be offered occasionally.
Absolutely avoid feeding protein sources (meat, insects, dog food, cat food), bread, dairy products, processed foods, or human meals. These cause severe kidney damage, shell deformities, and other serious health issues. Also avoid high-oxalate vegetables like spinach, kale, and beet greens in large quantities, as oxalates bind calcium and can contribute to nutritional deficiencies when over-consumed.
Calcium supplementation is crucial for shell and bone development and maintenance. Dust fresh food with calcium carbonate or calcium citrate powder at most feedings for juveniles and several times weekly for adults. Provide a cuttlebone or calcium block for free-choice consumption. Tortoises with regular outdoor access and natural UVB exposure need less supplementation than those housed exclusively indoors. Multivitamin supplements should be used sparingly, once weekly at most, as oversupplementation can be harmful. Indoor tortoises require vitamin D3 supplementation if not receiving adequate UVB lighting.
Feeding frequency varies by age. Juveniles should have fresh food available daily to support rapid growth. Adults can be fed daily or every other day depending on body condition and activity level. Monitor weight and adjust feeding to maintain proper body condition—tortoises should not be obese with fat visible around leg openings, but also shouldn't appear emaciated with sunken areas above the eyes or limbs. Offer food on flat stones, ceramic tiles, or feeding platforms to minimize substrate ingestion. Always provide fresh water in a shallow bowl large enough for soaking, changing it daily to maintain cleanliness.