Short answer: Yes if buying within 3 years. Conservative funds protect your deposit from market drops.
If you plan to buy within 3 years, yes. Conservative funds hold mostly cash and bonds. They do not grow as fast but they do not drop as much either. Growth funds can lose 20% in a bad year. If your house deposit drops 20%, you might no longer qualify for your mortgage.
Balance: $30,000
Growth Fund Drop: -20% = $24,000
Conservative Fund Drop: -2% = $29,400
Difference: $5,400 more preserved in conservative