Pro-Tekt® The Silicon Solution a silicon supplement, supplies higher levels of potassium and silicon to build stronger plant walls. Pro-Tekt® helps increase stem strength and leaf positioning, which improves photosynthesis. It also increases heat, drought and cold tolerance. Use as a supplement with any fertilizer. Recommended for all plants. Some sizes may not be stocked in all locations. Item will not ship UPS. Must ship on a pallet flat rate only.