Portfolios with the goal of capital growth consist mainly of equities. The exact proportion of equities to the total portfolio will vary according to the individual investor's investment horizon, financial constraints, investment goals and risk tolerance.
In general, a capital growth portfolio will contain approximately 65-70% equities, 20-25% fixed-income securities and the remainder in cash or money market securities. While seeking high returns, this mixture still somewhat protects the investor against a severe loss in portfolio value if the higher-risk equity portion of the portfolio takes a plunge.
Note that an aggressive portfolio strategy also aims to maximize capital growth, but of the total portfolio value, these strategies are of considerably higher risk; sometimes consisting entirely of equities!