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Medium height extensions can be used with medium sized EarlyGrow propagators Made of shatterproof and crystal clear plastic. The medium extensions add 10cm to the height of your EarlyGrow medium propagation Resistant to UV degradation from sun and grow light Adjustable ventilation to control airflow and moisture Made in the UK; Product description Adding one or two of the height extensions to your medium cold frame will prolong the usefulness as plants mature before planting or for those growing fresh herbs in winter to increase the freshness of your cooking. The ventilated sides help you maintain the desired humidity and temperature for optimal growth of immature plants. Each of the extensions adds another 10 cm under the lid of the cultivation. The sides have a positive lip that locks the bottom into place and each subsequent height extension for a positive fit as they are added in order. The lid fits in a similar way so you can lift it from the extensions to get plants from above, ideal for harvesting herbs without disturbing the EarlyGrow system. The height extensions can be disassembled when not in use for compact storage.; Product description Adding one or two of the height extensions to your medium cold frame will prolong the usefulness as plants mature before planting or for those growing fresh herbs in winter to increase the freshness of your cooking. The ventilated sides help you maintain the desired humidity and temperature for optimal growth of immature plants. Each of the extensions adds another 10 cm under the lid of the cultivation. The sides have a positive lip that locks the bottom into place and each subsequent height extension for a positive fit as they are added in order. The lid fits in a similar way so you can lift it from the extensions to get plants from above, ideal for harvesting herbs without disturbing the EarlyGrow system. The height extensions can be disassembled when not in use for compact storage.; Adding one or two of the height extensions to your medium cold frame will prolong the usefulness as plants mature before planting or for those growing fresh herbs in winter to increase the freshness of your cooking. The ventilated sides help you maintain the desired humidity and temperature for optimal growth of immature plants. Each of the extensions adds another 10 cm under the lid of the cultivation. The sides have a positive lip that locks the bottom into place and each subsequent height extension for a positive fit as they are added in order. The lid fits in a similar way so you can lift it from the extensions to get plants from above, ideal for harvesting herbs without disturbing the EarlyGrow system. The height extensions can be disassembled when not in use for compact storage.