noun
seed potato
A potato tuber used for planting, not for eating. Common in agricultural and gardening contexts.
春になったら種芋を植えます。
I will plant seed potatoes when spring comes.
種芋はホームセンターで買えます。
You can buy seed potatoes at home improvement stores.
Compound of 種 (たね, 'seed') and 芋 (いも, 'tuber'). The reading たねいも is a straightforward combination of the two components.