How to Grow Seedless Canadice Plants Indoors

Plant indoor grapes at any time of year, but plant them in spring to take advantage of the summer growing season. Prepare 15- to 20-gallon pots with drainage holes to ensure space and consistent drainage.

Mix a rich, quick-draining and moist potting soil for Canadice grapes. Combine 1 part peat moss, 1 part organic compost and 1 part potting soil or topsoil to give grapevines both nutrition and loose support. Fill each pot 3/4 full of this soil mixture.

Plant one Canadice grapevine per pot to give each vine enough space for root and foliage growth. Dig holes as deep as the root ball -- and twice as wide -- to spread the roots in the holes without bending. Fill the holes with soil mixture to secure the plantings, then give each grapevine a 6-foot stake for support. As the grapevines grow, tie them up to this support.

Prune each grapevine to two to three buds to encourage new growth. Put the pots outdoors during summer to take advantage of full sunshine and warm-air temperatures. Move the pots indoors before the first frost, to sites with full natural and artificial light every day. Don't put the plants near heating vents or fireplaces, as those will dry foliage and wood.

Water each grapevine with 1 gallon of water to settle the soil around the roots and establish your planting. Put them on a schedule of 2 inches of water every week thereafter. Use 1 inch of organic mulch to keep potting soil moist and warm.

Prune potted Canadice grapevines every spring to leave four vines or shoots from the main trunk. Trim these shoots to two to three buds each to control the season's growth and keep the grapevines manageable.

Feed grapevines with granular 10-10-10 fertilizer and new compost additions in the spring, before new growth begins. Follow manufacturer directions for fertilizer applications.