Q: How do I grow potatoes in a grow bag under my mulched apple tree? A: You can grow potatoes in a grow bag under your mulched apple tree by filling the bag with compost and planting the potatoes about 6 inches deep. Water regularly and fertilize every few weeks.

Q: What should I do if my roses have black spot and rust? A: To treat black spot and rust on roses, remove infected leaves and apply a fungicide. You can also improve air circulation around your roses by pruning them to remove dead or diseased canes.

Q: When should I feed my new tomato plants? A: Feed your new tomato plants every few weeks with a balanced fertilizer. Avoid over-fertilizing, as this can lead to problems such as blossom end rot.

Q: What’s the difference between vermiculite and perlite? A: Vermiculite is a mineral that is used to improve soil aeration and water retention. Perlite is a volcanic glass that is used to improve drainage and aeration. Both can be used in potting mixes and seed starting.

Q: What’s the best way to use old compost from containers? A: Old compost from containers can be used to improve the soil in your garden. Spread it around your plants and dig it in lightly. You can also use it as a mulch to help retain moisture and suppress weeds.

Gardening Tips

• Replace artificial lawn: Consider using natural grass, clover, or drought-tolerant plants instead.
• Prune lilacs: Prune lilacs after they have finished flowering to encourage new growth for next year.
• Control powdery mildew: Treat powdery mildew on plants with a fungicide or homemade remedies such as baking soda or neem oil.
• Improve brassica head formation: Ensure brassicas have adequate sunlight, water, and nutrients. Avoid over-fertilizing, as this can lead to excessive leaf growth at the expense of head formation.

Expert Answers to Your Questions

Month-by-Month Q&A

• January: Why did my healthy pittosporum suddenly lose all its leaves?
• February: Can I prune a fuchsia during winter, or should I wait until spring?
• March: How can I turn a small patch of lawn into a wildflower meadow?
• April: When should I prune my lilac?
• May: Can I put potatoes in a grow bag under my mulched apple tree?
• June: Is it too late to plant spring bulbs?
• July: How often should I water my dahlias and sweet peas?
• August: What is the best way to revive badly dehydrated potted hydrangeas?
• September: How can I reuse old compost?
• October: How can I get my peat-free compost to retain water?
• November: How can I improve the flowering of an old climbing rose?
• December: My water butt smells, can I still use this water for vegetables and other plants?