We　define　single　quantum　dots　of　lengths　varying　from　60　nm　up　to　nearly　half　a　micron　in　Ge-Si　core-shell　nanowires.　The　charging　energies　scale　inversely　with　the　quantum　dot　length　between　18　and　4meV.　Subsequently,　we　split　up　a　long　dot　into　a　double　quantum　dot　with　a　separate　control　over　the　tunnel　couplings　and　the　electrochemical　potential　of　each　dot.　Both　single　and　double　quantum　dot　configurations　prove　to　be　very　stable　and　show　excellent　control　over　the　electrostatic　environment　of　the　dots,　making　this　system　a　highly　versatile　platform　for　spin-based　quantum　computing.　Published　by　AIP　Publishing.