Food-grade soilless seedling sponge direct from the foam factory - high-density PU grow foam with even dotted holes for hydroponic planting, tray seeding, tissue culture and aeroponics. Custom sizes and colors. OEM/ODM.
GAOLESHI is a polyurethane foam source factory in Shenzhen, China. Our food-grade soilless seedling sponge is made by high-density PU foaming - clean white, evenly dotted planting holes, with balanced air and water retention to give seeds and roots a stable growing environment. It is widely used for hydroponic vegetable planting, tray seeding and germination, tissue culture hardening, and aeroponics / medium buffering.
Food-grade raw material: made from 100% virgin materials, safe for seeds and nutrient solution
Air & water balance: high-density open-cell structure holds moisture evenly without rotting seeds or roots
Root protection: dotted planting holes fix seedlings in place; roots spread freely for clean transplanting
Fully customizable: size, thickness, hole diameter, hole layout, sheet shape and adhesive backing
| Brand | GAOLESHI |
| Product | Soilless seedling sponge (grow foam plug) |
| Material | High-density polyurethane (PU) foam |
| Color | White (custom colors available) |
| Size | Non-standard, made to order |
| Holes | Dotted planting holes, custom diameter and layout |
| Applications | Hydroponic vegetable planting, tray seeding, tissue culture, aeroponics / medium buffering |
Seeding & germination: food-grade clean medium with even moisture lock - uniform sprouting, no seed rot
Hydroponic planting: dotted porous structure lets roots breathe and spread - hydroponics friendly
Factory bulk propagation: custom cutting for efficient large-scale seedling production - bulk supply, flexible sizes, greenhouse ready
Tissue culture hardening / aeroponics: uniform texture for seedling transition and medium buffering
Fully customizable: size, thickness, length, sheet shape and adhesive backing. Cut to order with flexible specs, ready for planting. Send us your drawings or samples for a quick factory-direct quotation.
Shenzhen Gaoleshi Household Products Co., Ltd. (GAOLESHI) is a polyurethane foam manufacturer integrating foaming, reticulation, cutting and shaping. Our product range covers filter sponge, cleaning sponge, packaging foam and seedling sponge. OEM / ODM orders are welcome - contact us for samples and quotations.
What is a soilless seedling sponge?
It is a food-grade open-cell PU foam with pre-punched planting holes, used as a clean soil substitute for hydroponic seeding, germination and seedling raising. Seeds are placed into the holes and the sponge keeps them evenly moist while roots breathe.
Is the seedling sponge safe for vegetables?
Yes. The sponge is produced from 100% virgin food-grade raw materials with no recycled content, making it suitable for hydroponic vegetables, fruits and leafy greens.
Can you customize the size and hole layout?
Yes. Size, thickness, hole diameter, hole spacing, sheet shape and even adhesive backing can all be customized. Send us your drawings or samples for a quick quotation.
Which growing systems is it compatible with?
It works with hydroponic NFT and DWC systems, seedling trays, tissue culture hardening, aeroponic towers and greenhouse propagation lines.
Do you support OEM and ODM orders?
Yes, OEM and ODM are welcome. As a source foam factory we offer factory-direct prices, custom logo printing and retail packaging.
Are samples available before ordering?
Yes, samples are available for quality confirmation - you only cover the freight. Contact us with your address and required specs.